To provide a push button device capable of mitigating a tilt of a button in pushing of the button even when a shape of the button is elongated.

The push button device is provided with a power supply button 1 having a pressing face 2 and shafts 5 and protrusions 3 and 4 provided in a side opposite of the pressing face 2, a recess 7 of a front cover 6 having guide parts 8 and 9 guiding movements of hinge parts 13 and 14 formed with protrusions 11 and 12 arranged so as to abut on the protrusions 3 and 4 of the power supply button 1, a back face part 10 having a through hole part 14 for movably inserting the shaft 5 and the protrusions 3 and 4 of the power supply button 1 toward the protrusions 11 and 12 direction, and a compression coil spring 16 provided between the power supply button 1 and the back face part 10.