PURPOSE: To provide a belt reversing device which can reverse a belt body to make it cylindrical using a space under a belt conveyor in use and effectively prevent the remainders of transferred product attached to the surface of the belt body from dropping on the ground.

CONSTITUTION: The height H of an outer supporting plate 4y is set at least lower than the height Ha of an inner supporting plate 4x located inside thereof. That is to say, the height H of the outer supporting plate 4y is formed the same as or lower than the height Ha of the inner supporting plate 4x to be lower than the height of a conventional inner supporting plate and an outer supporting plate, which can make the space under a belt conveyor in use wider.