A push switch includes an operating slider, an actuator with a sliding member, a return spring, a housing, a main body in which the operating slider, the actuator, and the return spring are supported by the housing, a heart cam mechanism (including an engagement pin and a cam groove) incorporated in the main body, an operating knob which caps the operating slider, and a fixed contact provided for a circuit board such that the sliding member is allowed to be brought into contact with and separated from the fixed contact. When the operating slider is moved upward or downward, the actuator is driven to be laterally slid. The housing is snap-fitted to an outer casing (upper casing) holding the circuit board. A space is provided between the housing and the circuit board.