Miyazaki Broadcasting Co., Ltd.
Native name
Kabushikigaisha Miyazakihōsō
Company typeKabushiki gaisha
FoundedMarch 24, 1954; 69 years ago (1954-03-24)
Headquarters4-6-7 Tachibana-dori Nishi, ,
Key people
Keizo Tsukuma
(President and CEO)
Number of employees
229 (2022)
Footnotes / references
Data from its Corporate Profile
Broadcast areaMiyazaki prefecture
Frequency936 kHz (AM); 90.4 MHz (FM)
BrandingMRT Radio 936 (MRT ラジオ 936, MRT rajio 936, "Miyazaki Broadcasting Radio 936 kHz")
FormatTalk, Sports
AffiliationsJRN, NRN
OwnerMiyazaki Broadcasting Co., Ltd.
First air date
March 25, 1954
Technical information
Power5 kW
AffiliationsJapan News Network
OwnerMiyazaki Broadcasting Co., Ltd.
First air date
1 October 1960
Former call signs
JONF-TV (1960-2011)
Former channel number(s)
10 (analog VHF, 1960-2011)
Technical information
Licensing authority

MRT Miyazaki Broadcasting Company (株式会社 宮崎放送, MRT miyazaki hoso kabushiki gaisha) is a broadcasting station in Miyazaki Prefecture, Japan, and it is affiliated with JRN, NRN (radio) and JNN (TV).[1] It is owned by the government of the prefecture, Mainichi Shimbun, the Bank of Miyazaki and various investors with fewer stocks.[2]

The name MRT comes from Miyazaki Radio and Television, the name was adopted in 1961 upon changing from RMK (Radio Miyazaki K.K.). MRT commences radio broadcasting in 1954,[3] and started television broadcasting in 1960.[4] On December 2006, MRT started digital terrestrial television broadcasting.[5]

Capital composition

Information as of March 31, 2015:[6]: 453–454 

Capital Total number of shares issued Number of shareholders
162,000,000 yen 324,000 shares 136
Shareholder Number of shares held Proportion
Miyazaki Broadcasting Stock Ownership Meeting 32,400 shares 10.00%
Mainichi Shimbun Publishing 32,000 shares 09.87%
Miyazaki Prefectural Government 31,500 shares 09.72%
Miyazaki Bank 16,200 shares 05.00%
Nippon Life Insurance 14,000 shares 04.32%
Asahi Kasei 12,000 shares 03.70%
Toshiba 10,000 shares 03.08%
Asahi Life Insurance 10,000 shares 03.08%
Dai-ichi Life 10,000股 03.08%


On May 30, 1953, the Ministry of Posts and Telecommunicationsannounced the frequency allocation plan for broadcasting in Miyazaki Prefecture. However, at that time, no industry in Miyazaki Prefecture was interested in applying to establish a private radio station[7]: 3–4  Minaminihon Radio (now Minaminihon Broadcasting) from neighboring Kagoshima Prefecture intended to build a relay station in Miyazaki and starting its broadcasts in the prefecture.[7]: 4  There was a strong reaction against Yamaguchi Toma, the then president of Hyuga Nichi Shimbun (now Miyazaki Nichi Shimbun), and he joined forces with politicians and financial figures in Miyazaki Prefecture to apply for the establishment of a private radio station.[7]: 4–5  On December 17 of the same year, Radio Miyazaki (ラジオ宮崎) applied for a broadcasting license,[7]: 6  held a founding conference on March 17 of the following year, and registered the company on the 24th.[7]: 11  At 5:20 in the morning on July 1, 1954, Radio Miyazaki officially started broadcasting.[7]: 15  Initially it broadcast on 1490 kc, but the station faced interference from Radio Yamanashi and the AFN Far East Network station in Gunsan, who both used the same frequency. To avoid direct interference, the station moved to 1480 kc (the only such occupier of said frequency in Japan at the time) on October 1, 1956.[7]: 30  The Nobeoka relay station opened in November 1956 and the Miyakonojo relay station in May 1958.[7]: 30  Thanks to the frequency change and the opening of the relay stations, the service area increased.

Headquarters building at the time of the start of analog television broadcasts (1960)
Television coverage area in 1960 (Hyuga Hishin Shimbun, page 12, October 1, 1960)

Radio Miyazaki applied for a television broadcast license on June 25, 1956.[7]: 39  In order to expand the coverage of radio waves, Miyazaki TV chose to build a signal transmitting station on the top of Mt. Crozuka with an altitude of 1,119 meters. It was also a rare attempt in Japan to build a signal transmitting station on the top of the mountain at that time.[7]: 39  At the same time, Radio Miyazaki also increased the number of employees and built a television broadcast hall to meet the hardware and manpower requirements for broadcasting television.[7]: 40–41  On October 1, 1960, Radio Miyazaki officially began broadcasting its television station[7]: 41  and joined the JNN network.[7]: 52  The following year, in order to reflect the actual situation of concurrent broadcasting and television operations, Radio Miyazaki changed its company name to Miyazaki Broadcasting, the abbreviation changed from the old RMK to the current MRT.[7]: 45  In 1962, Miyazaki Broadcasting achieved a 10% stock dividend.[7]: 45  In 1964, the 10th anniversary of its founding, Miyazaki Broadcasting renovated the Broadcasting Center and broadcast many commemorative special programs.[7]: 46–47  On December 10, 1966, Miyazaki Broadcasting started broadcasting in color.[7]: 53 

In 1977, Miyazaki Broadcasting began to introduce the electronic news gathering (ENG) system.[7]: 185–186  In the same year, Miyazaki Broadcasting decided to build a new building in the center of Miyazaki,[7]: 71–73  and construction started in 1982.[7]: 75  To commemorate the 30th anniversary of the broadcast and as part of corporate identity , Miyazaki Broadcasting launched the second generation trademark in 1984.[7]: 75–76  At the end of August of the same year, the new Miyazaki Broadcasting Center was completed. The building has one floor underground and seven floors above ground, with a total floor area of 12,700 square meters and a cost of 3.3 billion yen.[7]: 81  The first to third floors of the building are the commercial and cultural facilities MRT micc; the fourth to seventh floors are the office spaces of Miyazaki Broadcasting, of which the fourth floor is a broadcast recording studio and the fifth floor is a television studio.[7]: 81–8  Starting from September 1 of the same year, Miyazaki Broadcasting began to broadcast programs from the new headquarters.[7]: 84–86 

Miyazaki Broadcasting began broadcasting digital TV signals on December 1, 2006, and ended broadcasting analog TV signals on July 24, 2011.[8] In 2014, Miyazaki Broadcasting launched a new logo on the occasion of its 60th anniversary.



TV (Analog)

Until July 24, 2011:

TV (Digital)


  1. ^ "JNNネットワーク". TBS Holdings. Retrieved 2023-02-10.
  2. ^ "地上系放送事業者". MIC. Retrieved 2023-02-16.
  3. ^ "民放ラジオ開局一覧". JBA. Retrieved 2023-03-03.
  4. ^ "民放テレビ開局一覧". JBA. Retrieved 2023-02-14.
  5. ^ "地上デジタルテレビジョン放送". Nikkei Xtech. Retrieved 2023-03-04.
  6. ^ 日本民間放送連盟 (2015). 『日本民間放送年鑑 2015』 (Japan Private Broadcasting Yearbook 2015) (in Japanese). Tokyo: コーケン出版. ISBN 9784990809003.
  7. ^ a b c d e f g h i j k l m n o p q r s t u v w x 宮崎放送開局三十周年記念事業委員会 (1984). 『宮崎放送三十年史』 (Thirty Years of Miyazaki Broadcasting) (in Japanese). Miyazaki City: 宮崎放送.NCID BN02031634
  8. ^ 開局済みのデジタル親局、及びデジタル中継局一覧 (in Japanese). 総務省. Archived from the original on 2019-03-31. Retrieved 2020-09-08.