Abstract: A push button switch having an interlocking device, the switch having a pair of two spaced adjacent push buttons each movable downwardly from an inoperative to an operative position, a pin position between the two push buttons and having a horizontal longitudinal axis extending transversely to a vertical plane between the push buttons and around which the pin is rotatable, and an interlocking lever extending between the push buttons and having opposite ends engaged with respective ones of the push buttons for tilting the lever when the push buttons are moved, the interlocking lever having a fulcrum projecting downwardly from the central portion thereof and, when both the push buttons are in the inoperative position, having the lower end supported on the rotatable pin, and movable for, when one of the push buttons is moved downwardly, being tilted toward the downwardly moved push button and having the fulcrum moved around the pin to a position on the opposite side of the pin from the downwardly moved push butt