To smoothly deliver and receive even small product works between conveyors without breaking the works by forming an attachment to change its height to the lowest possible at an end of the conveyor after completion of the purpose of carrying.

Soft belt members which can be deformed at an end part of a conveyor into an inverted U-letter shape having an inner hollow are applied to a flat endless belt along the whole width of the belt at a constant pitch which can be divided to length of the endless belt. By changing a long distance D of both end lens in a loop 3 of the inverted U-letter shape, the loop 3 can be closer to a belt tension member 1. A height of the inverted U-letter loop 3 is lowered like an S-letter when the tension member 1 is on a straight line. Sizes D, H, S are thus determined in accordance with a size of a work to be convenient for transfer at an end of the conveyor from the other conveyor.