To obtain a device by which foreign matters mixed in soft and light food such as dried small sardines and dried strips of radish are effectively removed and the removed foreign matters can be easily taken out.

A suction port 32 is opened on one side of a negative pressure chamber 30 communicating with a fan, and on the rear of the suction port, a gas permeable belt conveyor 12a moving between two rollers arranged in the vertical direction is arranged. The return side of the conveyor belt 12a is wound on a draw-out roller provided on the other side of the negative pressure chamber 30, and near the draw-out roller, a blow-off port 22 of pressure air directed to the rear of the conveyor belt is arranged and in front of it, a foreign matter receiver 23 is arranged.