Operation switch device

An operation switch device, comprising:

• a circuit board;
• first and second push switches disposed on the circuit board to have a determined height above the circuit board, each of the push switches including a movable part exposed to an outside for reacting to an external pressing operation;
• first and second touch detecting electrodes formed on the circuit board respectively in proximity to the first and second push switches;
• an operation detecting circuit connected with the push switches and the touch detecting electrodes;
• and
• an operation member made of dielectric material and disposed to oppose the circuit board with the first push switch interposed between the operation member and the circuit board, the operation member including a rib part projecting toward the first touch detecting electrode on the circuit board to reduce a distance between the operating member and the first touch detecting electrode, the rib part including a cutaway part to increase a distance between the operating member and the second touch detecting electrode, and the operation member being displaceable such that the pressing operation on the operation member causes depression of the movable part of the first push switch provided under the operable member;
• wherein the operation detecting circuit detects a touch operation on the operation member using the first touch detecting electrode formed in proximity to the first push switch on the circuit board, and detects the pressing operation on the operation member using the first push switch.