A component supply device is configured to feed a component having a through hole to a target position. The component supply includes: a rod including at its distal end a holding portion to be inserted into the through hole; an actuator; a valve mounted on the rod; and a fixing portion by which the valve that advances with the rod passes. The rod includes a gas outlet located in an outer periphery of the holding portion and configured to blow gas rearward, and a gas passage extending inside the rod and configured to send gas supplied from a gas source to the gas outlet. The valve includes a push switch configured to be switched between an advanced attitude and a withdrawn attitude, and a biasing unit configured to bias the push switch to the withdrawn attitude. The fixing portion includes a pressing wall portion facing the push switch.