The New Japan Broadcasting System, Inc. (新日本放送株式会社, Shin-Nippon Hōsō Kabushiki-gaisha, NJB) was founded on December 27, 1950.

[1]: 14  At the same time, Kansai businessmen Shinyoshi Terada and Aiji Iwasaki are also interested in getting involved in the broadcasting industry.

The two hit it off immediately, and held a symposium on December 11, 1945, and decided to establish the "New Japan Broadcasting" company.

[1]: 14–15  However, at that time, the Commander-in-Chief of the Allied Forces in Japan preferred to continue the Japanese broadcasting industry's monopoly system of the Japan Broadcasting Corporation (NHK) (among the four Allied countries, especially the Soviet Union, NHK preferred to monopolize it), and did not allow private radio stations to be established, so this idea wasn't quickly achieved.

From October 1947, the occupied government gradually began to favor allowing the establishment of private broadcasters.

[1]: 22  At that time, 12 operators in the Kinki area, supported by Mainichi Shimbun, were most likely to obtain a license.

After Tanaka Kakuei took office as the Post Minister in July 1959, he used political skills to move the TV channel plan in the Himeji area to Osaka, so that two new private TV stations could be built in the Osaka area.

NJB founded Osaka Television Co., Ltd. (大阪テレビ放送株式会社, Ōsaka Terebi Hōsō Kabushiki-gaisha, OTV) on December 1, 1956 with Asahi Broadcasting Corporation (ABC).

In 1990, the new headquarters and studios was completed in Chayamachi, Kita Ward, Osaka for the station's 40th anniversary.

On April 1, 2016, the radio and television divisions of MBS were taken over by the second incarnation of Mainichi Broadcasting System.

[4] The split was completed on April 1 of the following year with MBS Radio retaining the JOOR callsign.