The Texas pitcher presented the check Wednesday to Rachel Robinson, the widow of Jackie Robinson and founder of the foundation, during her visit to Tokyo. Jackie Robinson wore No. 42, which has been retired by Major league Baseball and won't be worn by anyone else following Mariano Rivera's retirement after this season.
Darvish has been home in Japan since the Rangers season ended with a loss to Tampa Bay in the AL wild-card tiebreaker game.
Over 1,400 students have benefited from the Jackie Robinson Foundation, which was founded in 1973 in honour of the Hall of Fame second baseman who broke Major League Baseball's colour barrier in 1947.