Upward urging force by operation force of a tact switch and restoring force of a rubber body are applied to an operation body via a pressing body. Then, pressing operation of a push button section causes the operation body to press down the rear ends of left and right sections of the pressing body. This follows that, with both contact sections in contact with a step section functioning as the support points, an operation section on the front end of the pressing body is pressed up to turn on the tact switch. In this process, when the push button section is pressed, the center of rotation of the operation body is changed depending on which portion of the push button section is pressed, causing the distance between a pressed portion of the operation body and the center of the rotation are almost equal independent of which portion is pressed. As a result, the load to operate the push button section is substantially equalized independent of which portion of the operation body is pressed. Also, the load to operate the operation body can be changed as desired by changing the position of the step section which is to be in contact with both contact sections functioning as the support point for the pressing body.