To correspond to a small space, simplify structure, and make smooth operation possible by installing a hinge part whose one end is connected to the lower end side end part of a main body part and other end is extended in the central lower direction of the main body part and connected to a supporting part of act as spring effect.

The upper parts of hinge parts 31, 32 are connected to the positions near to the ends of right and left edges 22, and the lower parts are connected to the positions near to the central part of a base rib 33. A main body part supporting arm 30 constituted like this is molded together with the main body part with resin. When a seesaw button 10 is turned in the allow P direction, the tip of a switch pushing part 24 comes in contact with a switch part 14 to turn on it, the hinge part 31 is compressed, and the hinge part 32 installed line-symmetrically is stretched. When pressing on the P side is released, the seesaw button 10 is returned to the original position by the elastic force of the hinge parts 31, 32. When the Q side is pressed, a switch part 15 in the opposite direction to when the P side is pushed turned on. Plural seesaw buttons 10 can be connected and molded integrally with resin.