
Mitsui Koji ( March 6, 1910 - April 20, 1979 ) was a Japanese actor. His real name was Mitsui Hikohide. After the war, he played an active role as a supporting actor in films directed by Akira Kurosawa and Yasujiro Ozu . His former stage name was Mitsui Hideo.
Changed his stage name to Mitsui Koji in Ozu's Hen in the Wind (1948) . His role as the playboy Kisaburo in Kurosawa Akira 's The Lower Depths (1957) won him the Best Supporting Actor award at the 12th Mainichi Film Awards and the 8th Blue Ribbon Awards, solidifying his status as a supporting actor.
After going freelance in 1960, he worked not only in films but also in television dramas and on stage, but after undergoing surgery for a stomach ulcer in 1971, his health deteriorated and he scaled back his acting career.
He died of heart failure on April 20, 1979 at a hospital in Kamakura. He was 69 years old.

High and Low
1963 · as Second Reporter

Red Beard
1965 · as Heikichi

Woman in the Dunes
1964 · as Village Elder

The Hidden Fortress
1958 · as Guard (uncredited)

Dodes'ka-den
1970 · as Foodstand owner

The Bad Sleep Well
1960 · as Reporter A

The Human Condition I: No Greater Love
1959 · as Furuya

The Battle of Okinawa
1971

Japan's Longest Day
1967 · as Old Journalist

Floating Weeds
1959 · as Kichinosuke

The Lower Depths
1957 · as Yoshisaburo the Gambler

A Story of Floating Weeds
1934 · as Shinkichi

Scandal
1950 · as Cameraman A

Early Spring
1956 · as Hirayama

Kiku and Isamu: Two Siblings Born in Japan
1959 · as Shopkeeper

Ishimatsu of the Forest
1949

Drunkard's Paradise
1962

Epitaph to My Love
1961 · as Torikie