Joji Oka, born in Tokyo, Japan, on May 25, 1902, was a renowned Japanese actor celebrated for his versatile roles in the film industry. His given name was Katsuzo Nakamizo, and he also used alternate names, including Susumu Minobe.

Oka embarked on his cinematic journey in the late 1920s, making his debut with the film "Ryuko no Maki Tora no Maki" in 1928. He rose to prominence as a leading actor in movies like "Akai Hi Aoi Hi" (Red Lights, Blue Lights) in 1929. His influence extended across silent and sound films, where he showcased his remarkable voice and talent.