An expansion valve includes a valve main body having a valve chamber therein, a valve body arranged within the valve chamber, a valve body support member supporting the valve body, an urging member urging the valve body toward a valve seat, an actuating bar pressing the valve body in an opening direction of the valve against urging force generated by the urging member, and a vibration proof spring suppressing vibration of the valve body or the actuating bar. The actuating bar has an outer peripheral surface of which a part constitutes a contact surface slidably contacting with the vibration proof spring, and the contact surface has a shape by which the amount of deformation of the vibration proof spring becomes greater as the valve body goes towards a closing direction of the valve.