How many movies have Eiichi Yamada and Joji Oka collaborated on?

They have worked on 7 movies together! Their first movie together was 旗本退屈男　八百八丁罷り通る (1953) while their highest rated movie together was Hanjiro of Kusama: Bird of Passage (1960). They have not worked together since Hanjiro of Kusama: Bird of Passage (1960).