How many movies have Iwao Ishii and Tatsumi Ichiyama collaborated on?

They have worked on 4 movies together! Their first movie together was Tora-san's Cherished Mother (1969) while their highest rated movie together was Tora-san's Runaway (1970). They have not worked together since Tora-san's Shattered Romance (1971). They are most known for their comedy films together.