A bolt supply apparatus (1) recognizes images of bolts conveyed by a conveyor (22) using a camera (24) and feeds the recognized bolts to a next operation step using a robot (26). Bolts to be conveyed from a hopper (10) through a spiral feeder (14) are temporarily stored in a first storage box (16). Weight of the first storage box (16) is measured by a first weight measuring device (18). When the first weight measuring device (18) measures a given weight, the bolts of the first storage box (16) are supplied to the conveyor (22).