PURPOSE: To provide a film processing method and a film processing device by which sheet-like photosensitive material is rapidly processed to be developed.

CONSTITUTION: In this film processing method, the sheet-like photosensitive film F which is longer in a length direction than in a breadth direction is carried in the length direction and supplied, and the supplied photosensitive film is developed; and the photosensitive film F carried in the length direction and supplied is developed while it is carried in the breadth direction.