A tape feeder (a component supplying device) which transports a carrier tape covered with a cover tape and storing components to a component pick-up position, peels off the cover tape before the component pick-up position, and supplies the stored components to a component mounter, the tape feeder including photo-switch (a detector) which detects presence or absence of tension acting on the cover tape, the cover tape is peeled off from the carrier tape, a feeder storage unit (a storage unit) which stores the presence or absence of tension which is detected by the photo-switch, and an operation determination unit (a determination unit) which determines a processing operation performed when power which is supplied to the tape feeder is reintroduced based on the presence or absence of tension which is detected.