To provide a residual material removing device for a conveyor applicable to a conveyor of fast carrier speed and a conveyor with short intervals of flights and partition walls without generating noises.

This residual material removing device 20 scratches off residual materials after a carrier processing stuck to an internal surface of each flight 10 in the mid-way of a returning path of a flight conveyor 1 and is provided with a plurality of scratching plates 21 for scratching residual materials. Each scratching plate 21 moves along a round path forming a prescribed angle with a traveling path of a flight 10 and is successively led to a standby position P on the traveling path of the flight 10. Each scratching plate 21 is set in attitude so that the scratching plate 21 led to the standby position P may form an acute angle with a traveling direction of the flight 10 and is held at an attitude at the standby position P during the scratching operation.