RKB Mainichi Broadcasting
RKB Mainichi Broadcasting is a Fukuoka-based Japanese commercial broadcaster operating television and radio services affiliated with the JNN and JRN networks.
Last updated August 26, 2026
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Overview
RKB Mainichi Broadcasting is a commercial radio and television broadcaster serving Fukuoka Prefecture and the wider northern Kyushu region of Japan. Its roots date to the creation of Radio Kyushu in 1951, following the postwar liberalization of Japanese broadcasting under the Radio Law. The station began radio operations on 1 December 1951 under the JOFR callsign and became the first private radio broadcaster in Kyushu. Although Mainichi Shimbun was an important founding sponsor, the company also attracted capital from regional industrial businesses, including Nippon Steel and Kyushu Electric Power, reflecting the locally rooted ownership structure common among Japan’s early private broadcasters. The company expanded into television during the rapid growth of Japanese commercial broadcasting. RKB TV began regular service on 1 March 1958 as a channel 4 station. A related company, Mainichi Seibu Television, had separately received a license for the Kitakyushu and western Yamaguchi areas; the two businesses merged later in 1958, producing the RKB Mainichi Broadcasting organization and brand. After an initial period carrying programming from both KRT, the predecessor of TBS, and Nippon Television, RKB became a dedicated KRT affiliate following the launch of TV Nishinippon. It became a founding participant in the Japan News Network in 1959 and remains associated with JNN television programming. Its radio service joined the Japan Radio Network in 1965. RKB developed a broad regional media role rather than functioning solely as a relay station. Its television operation built a reputation for local news, information programming, sports, public affairs, and regional reporting, while the radio service combined news, music, talk, and sports coverage. The station’s local orientation was reinforced by international sister-station relationships, news-bureau responsibilities, and coverage of major events affecting Kyushu. RKB was also an early adopter of color broadcasting, stereo television, electronic news gathering, digital television, internet radio distribution, and FM relay broadcasting. The broadcaster enjoyed particularly strong television ratings during the 1970s, when it reportedly led the Fukuoka market for eleven consecutive years on the combined major ratings measures. Competition intensified in later decades as other Fukuoka broadcasters expanded. RKB responded by developing programming for more specific radio audiences, strengthening regional events and public outreach, and broadening activities such as housing exhibitions and audience festivals. It moved to a new headquarters in Momochihama in 1996, a prominent waterfront media district in Fukuoka. RKB’s television service transitioned from analog to digital broadcasting in 2011. Its radio service joined the radiko online platform in 2011 and began FM broadcasting in 2016, complementing its AM network. The company has been preparing for the long-term reduction of AM operations, including the suspension of its Yukuhashi AM relay in 2024 and the planned effective cessation of AM broadcasting by or before 2028. Today, RKB operates as a regional multimedia broadcaster, combining terrestrial television, AM and FM radio, online audio distribution, local journalism, entertainment, sports, and community-oriented events under the +rkb branding.
History
RKB Mainichi Broadcasting emerged from the first wave of private broadcasting in postwar Japan. After the Radio Law created a framework for commercial radio licensing, Mainichi Shimbun pursued stations in several major regions. The Fukuoka application was organized as Radio Kyushu, with investment from Mainichi and regional companies including Nippon Steel and Kyushu Electric Power. A preliminary license was issued in April 1951, the company was established in June, and trial broadcasts began in October. Regular radio service started on 1 December 1951 under the JOFR callsign. Radio Kyushu was among Japan’s earliest private radio companies and was the first private radio station in Kyushu. The new broadcaster initially concentrated on news, music, and sports. Its early programming included the news program Eye on the Mic and professional baseball coverage, while its regional sports role expanded through events such as the Beppu-Oita Marathon. The station opened an Ogura relay station in 1952, an early example of private radio relay infrastructure in Japan. Radio operations later expanded to overnight and eventually 24-hour broadcasting. In the 1970s, long-form news and targeted programming became important tools for maintaining radio relevance as television grew. The station increased its transmission power in 1972 and organized Radio Weeks from the 1980s onward to connect programming with audiences across Fukuoka Prefecture. RKB entered television after seeking a television license in the mid-1950s. Experimental transmissions began in February 1958, followed by regular service on 1 March. The related Mainichi Seibu Television operation covered areas around Kitakyushu and western Yamaguchi; its merger with RKB in August 1958 created the modern RKB Mainichi Broadcasting company. The new television station initially carried programs from both KRT and Nippon Television, but the arrival of TV Nishinippon changed the local affiliation landscape. RKB subsequently became a KRT-only affiliate and joined the Japan News Network when that network was formed in 1959. Its radio operation joined the Japan Radio Network in 1965. Technological development was a recurring feature of RKB’s history. The station made its first color television transmission in April 1966, becoming the first television station west of Osaka to do so, and produced its first internally made color program in 1968. By October 1970, all prime-time television programming was in color. Stereo television began in 1980. Electronic news gathering equipment introduced in 1976 strengthened the station’s ability to report quickly and flexibly. RKB also built news relationships beyond Japan, including sister-station agreements in the United States and South Korea and JNN bureau responsibilities in Seoul and Bangkok at different times. During the 1970s, RKB broadened its commercial and public role. It organized a large Fukuoka Festival in 1972, developed housing-showroom activities to supplement advertising revenue, and introduced a two-day weekend system in 1975. Its television ratings were especially strong from 1969 through 1979, when it achieved the Fukuoka market’s combined ratings lead for eleven consecutive years. The competitive environment changed in the 1980s as KBC and later TV Nishinippon strengthened their positions. RKB television revenue exceeded ten billion yen in fiscal 1983, and the station marked its 35th anniversary with an extended special broadcast in 1986. RKB moved to new facilities in Momochihama on 1 July 1996. The relocation coincided with changes in the allocation of JNN overseas reporting responsibilities: RKB’s Seoul bureau duties were transferred to TBS, while RKB took responsibility for the Bangkok bureau, later returning to Seoul coverage in 2002. In 1997, RKB Radio launched its radio festival, creating a recurring public-facing event. The company also commemorated its fiftieth anniversary in 2001 with a lengthy special radio broadcast. The broadcaster entered the digital era in stages. Digital television transmission began in 2006, and the company introduced a lowercase wordmark in 2007. Japan’s nationwide analog television shutdown ended RKB’s analog television service on 24 July 2011, after which the station continued digitally. RKB Radio joined radiko in December 2011 and began FM broadcasting in March 2016. More recently, the radio operation has been adapting to Japan’s changing AM policy and listening habits. The Yukuhashi AM relay was suspended in February 2024, with service maintained through Wide FM and other nearby transmitters. RKB has stated an objective of becoming effectively FM-based by or before 2028. Its current identity combines regional broadcasting, local reporting, network affiliation, digital distribution, and community participation under the +rkb brand.
- 2024
Yukuhashi AM relay is suspended
[1]RKB suspends the Yukuhashi AM relay while retaining coverage through Wide FM and other nearby facilities.
- 2016
FM radio service begins
[1]RKB Radio adds FM broadcasting, supporting its long-term move toward a full FM service.
- 2011
Analog television service ends
[1]RKB ends analog television transmissions as part of Japan’s nationwide digital transition.
- 2006
Digital television launches
[1]RKB begins digital television broadcasting.
- 1996
Move to Momochihama headquarters
[1]RKB transfers its headquarters to new premises in Fukuoka’s Momochihama district.
- 1980
Stereo television begins
[1]RKB starts stereo television broadcasting.
- 1972
Fukuoka Festival is held
[1]RKB organizes a major festival marking Fukuoka’s twentieth anniversary as a designated city, attracting more than 150,000 attendees.
- 1969
Seoul bureau opens
[1]RKB opens a JNN bureau in Seoul, expanding its contribution to international news coverage.
- 1966
First color television broadcast
[1]RKB becomes the first television station west of Osaka to transmit a color broadcast.
- 1959
Founding JNN affiliation
[1]RKB becomes an early affiliate of the Japan News Network.
Products and positioning
A locally rooted Fukuoka and northern Kyushu broadcaster combining JNN television programming, JRN radio affiliation, regional journalism, sports, entertainment, and community engagement.
Commercial television · 1958
RKB Television
RKB’s terrestrial television service for Fukuoka and surrounding parts of northern Kyushu. It carries JNN network programming alongside locally produced news, information, sports, entertainment, and public-affairs content. The service moved from analog to digital transmission in 2011 and uses channel allocation 4 in Fukuoka.
AM and FM radio · 1951
RKB Radio
The company’s radio operation, originally launched as Radio Kyushu, provides local news, talk, music, sports, and long-form information programming. It is affiliated with the Japan Radio Network, distributes through radiko, and has added FM transmission while preparing for a longer-term reduction of AM broadcasting.
Regional journalism
RKB News
Regional news reporting delivered through RKB’s television, radio, and digital channels, with coverage focused on Fukuoka, Kyushu, disasters, politics, business, and community affairs.
Digital media · 2011
RKB digital and radiko distribution
RKB extends its terrestrial content through digital television and internet audio distribution. Radio became available through radiko in 2011, giving listeners an online route to the station’s programming in addition to terrestrial AM and FM reception.
Marketing campaigns
- 1997RKB Radio Festival
Fukuoka
An audience-facing radio festival created to strengthen contact between RKB Radio and the public through live programming and community activities.
- 1982RKB Radio Weeks
Fukuoka Prefecture
A radio programming initiative modeled in part on MBS Radio’s approach, using long-form programs produced from multiple locations across the prefecture to increase local participation.
- 1972Fukuoka Festival
Fukuoka
A large public festival organized to mark Fukuoka’s twentieth anniversary as a designated city. The event demonstrated RKB’s role in civic and cultural activities beyond ordinary broadcasting.
Outcome. The festival reportedly attracted more than 150,000 attendees.
Brand decisions
2024
Suspension of the Yukuhashi AM relayStrategyBackground
RKB’s radio strategy includes a gradual shift away from reliance on AM transmission toward FM and digital delivery.
Action taken
RKB suspended its Yukuhashi relay station in February 2024 and continued coverage through Wide FM and other nearby transmitters.
Aftermath
The change represents an incremental step toward the planned effective suspension of AM operations by or before 2028.
2016
Expansion into FM broadcastingStrategyBackground
RKB Radio was adapting to changing listening habits and the long-term policy environment affecting Japanese AM broadcasters.
Action taken
RKB began FM broadcasting and subsequently developed a plan to become effectively FM-based by or before 2028.
Aftermath
The radio service gained an additional terrestrial distribution path while retaining AM facilities during the transition.
1959
Move to an exclusive KRT television affiliationStrategyBackground
RKB initially carried programming from both KRT and Nippon Television, but the launch of TV Nishinippon changed the local network arrangement.
Action taken
RKB withdrew Nippon Television programming and became a sole KRT affiliate before joining the Japan News Network.
Aftermath
The decision placed RKB within the television network structure that later developed around TBS and JNN.
1958
Merger with Mainichi Seibu TelevisionM&ABackground
Mainichi Seibu Television had been licensed to serve Kitakyushu and western Yamaguchi while RKB was developing television service in Fukuoka.
Action taken
The two companies merged on 1 August 1958, forming the RKB Mainichi Broadcasting organization.
Aftermath
The merger consolidated the company’s television footprint and established the corporate structure associated with the RKB name.
Recent events
- 2024
RKB suspends the Yukuhashi AM relay[1]
Regulation
RKB ends operation of its Yukuhashi AM relay while continuing service in the area through Wide FM and nearby AM and FM facilities.
- 2016
RKB begins FM broadcasting[1]
Product launch
The radio operation adds FM transmission as part of its longer-term transition toward a broader FM-based service.
- 2011
RKB joins radiko[1]
Product launch
RKB Radio becomes available through radiko, extending its radio service to internet distribution.
- 2006
RKB begins digital television transmission[1]
Product generation
RKB starts digital television broadcasting using channel allocation 4 in Fukuoka.
- 1959
RKB joins the Japan News Network[1]
Other
The broadcaster becomes an early JNN affiliate after aligning its television operation with KRT, the predecessor of TBS.
- 1958
RKB launches commercial television service[1]
Product launch
RKB begins regular television broadcasting and later merges with Mainichi Seibu Television, expanding its service across Fukuoka and the surrounding region.
- 1951
RKB becomes the first private radio broadcaster in Kyushu[1]
Other
Radio Kyushu begins regular radio broadcasting in Fukuoka, establishing the organization that later becomes RKB Mainichi Broadcasting.
Sources2 sources
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