Abstract: A push-button switch which has a comparatively small overall thickness or height and rattling of a stem upon movement is eliminated or minimized. The push-button switch includes a stem having a flat plate and a plurality of legs each having a protruded portion at an end thereof. The flat plate of the stem is placed on a click rubber element accommodated in an insulating case while upper portions of the protruded portions of the stem are resiliently engaged with an open end of the insulating case to position the protruded portions within the insulating case. The insulating case has a plurality of relief grooves formed at a plurality of corner portions thereof, and when the stem is depressed, the protruded portions thereof are inserted into the relief grooves. Sliding surfaces for the protruded portions of the stem are formed at the corner portions of the insulating case between the open end of the insulating case and an inner bottom face of the relief grooves 25.