How many movies have Hiroshi Koizumi and Sadao Sugihara collaborated on?

They have worked on 7 movies together! Their first movie together was Utae! Seishun Harikiri Musume (1955) while their highest rated movie together was Sazae-san (1956). They have not worked together since Sazae-san Plays Cupid (1961). They are most known for their drama films together.