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Keiji Sada was a Japanese actor. He won the award for best actor at the 7th Blue Ribbon Awards for Anata kaimasu and Taifū sōdōki. He was the father of the actor Kiichi Nakai.

He is primarily known for starring in Ozu films especially in the 1950s most famously Good morning (1959) he also was a supporting actor in 2 of the human condition films of which there were 3 in total, he died at the age of 37 in 1964.