According to the present disclosure, a tape feeder includes a main body that is attached to a component mounter and has a tape traveling path which is a traveling path of a carrier tape; and a sprocket that is provided in the main body, causes an outer peripheral tooth to engage with a feed hole of the carrier tape, and rotates so as to perform pitch feeding of the carrier tape on the tape traveling path. The tape feeder includes a lock mechanism that has a press operation unit operated with pressing force, locks the sprocket in the main body in a state where the press operation unit is not operated, and unlocks the sprocket in a state where the press operation unit is operated.