A push button switch for use with an operating key of electronic appliances having a long working stroke, a clear step feeling during the switching operation, and an overstroke after switching is complete. The switch contains a pressure member 17 made of elastic material disposed between the push button 18 and movable contact point 16. As the domed movable contact point 16 is pressed during the switching operation via the pressure member 17, the working stroke of the switch can be made longer for a quantity equivalent to that of the compression deformation in the pressure member 17, before and after the reversal action of the domed movable contact point 16. Also, there is provided a clearance for outward expansion for the top extrusion of the pressure member 17 during compression deformation. Due to the alignment of these components, the possibility of the pressure member 17 and push button 18 dislocating or rattling is minimized. Once the top part of the push button 18 has been pressed with an operating key of the electronic appliance and the switching is complete, the lid 19 of the box-shape case 11 protects the push button 18 and the movable contact point 16 from excessive forces or damage.