Push button switch with alternate action mechanism

In a push button switch with an alternate action mechanism comprising a manipulation rod having a slide block mounting a slide and provided with a heart cam formed in the upper surface thereof, a case having a plurality of terminals fixed thereto and adapted to slidably support said slide block, and a substantially Z-shaped driving pin pivotally supported at its one end by said case and adapted to move at its other end along said heart cam, whereby, as said manipulation rod is depressed, said slide block is slid to change the electric connection between said terminals, and said manipulation rod is locked in the depressed state by a cooperation of between said driving pin and said heart cam,

• an improvement which comprises that the lateral wall of the heart cam groove constituting said heart cam in said slide block extending in the logitudinal direction of said manipulation rod is formed by the inner peripheral surface of said case.