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

They have worked on 10 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).