In a tape feeder which serves as a component supply device which is used for supplying components in a component mounter, a first unit which serves as a tape feed unit which pitch feeds a carrier tape which holds components to a component suction position using a pitch feeding sprocket drive mechanism, and a third unit and a second unit which serve as a tape supply unit which is attachable and detachable in relation to the tape feed unit and which supplies the carrier tape to the tape feed unit are selectively used according to the supply mode of the carrier tape to be used.