The Yomiuri Giants are the oldest team of the Japanese professional baseball circuit and were founded in 1934. Many of the teams already existed before the inauguration of the current league system in 1950, although the franchises and locations of some of them, especially of teams in the Pacific League, have changed in the course of time.
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NPB. (January 18, 2022). Year of founding of professional baseball teams playing in Nippon Professional Baseball (NPB) in Japan as of 2021 [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 21, 2026, from /statistics/1282559/npb-year-of-founding-by-team/
NPB. "Year of founding of professional baseball teams playing in Nippon Professional Baseball (NPB) in Japan as of 2021." Chart. January 18, 2022. ÌÇÐÄÆƽâ°æ. Accessed July 21, 2026. /statistics/1282559/npb-year-of-founding-by-team/
NPB. (2022). Year of founding of professional baseball teams playing in Nippon Professional Baseball (NPB) in Japan as of 2021. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 21, 2026. /statistics/1282559/npb-year-of-founding-by-team/
NPB. "Year of Founding of Professional Baseball Teams Playing in Nippon Professional Baseball (Npb) in Japan as of 2021." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 18 Jan 2022, /statistics/1282559/npb-year-of-founding-by-team/
NPB, Year of founding of professional baseball teams playing in Nippon Professional Baseball (NPB) in Japan as of 2021 ÌÇÐÄÆƽâ°æ, /statistics/1282559/npb-year-of-founding-by-team/ (last visited July 21, 2026)
Year of founding of professional baseball teams playing in Nippon Professional Baseball (NPB) in Japan as of 2021 [Graph], NPB, January 18, 2022. [Online]. Available: /statistics/1282559/npb-year-of-founding-by-team/
