How many movies have Sonosuke Niki and Takashi Koshiba acted in together?

They have worked on 9 movies together! Their first movie together was Ashita wa Ashita no Kaze ga Fuku (1958) while their highest rated movie together was Detective Bureau 2-3: Go to Hell, Bastards! (1963). They have not worked together since The Sands of Kurobe (1968).