[Problem] The present invention provides a method and a device which, in a process of producing instant cooked rice or frozen cooked rice, loosen cooked rice into individual grains sufficiently and wholly, and particularly, provides a loosening method and device which gives smaller damage such as smashing cooked rice. [Solution] Using a device including a loosening room 21, 22, 23, ... into which cooked rice is fed, an air blowing port 31 which is configured to blow high-speed air toward the cooked rice in the loosening room； and a collecting room 26, 27 provided adjacent to the loosening room with a wall therebetween, the high-speed air is blown from the blowing port and is blown to the cooked rice in the loosening room such that the cooked rice is scatted and floated by blowing the air, and the cooked rice floating and moving over the wall is collected by the collecting room.
