To provide a push-button device capable of evenly depressing a tact switch to stably electrically connect electrodes to each other by depressing an input button without impairing a click feeling even when the diameter of the tact switch is reduced to miniaturize it.

This push-button device 1 includes: the input button 2; the two electrodes 4a and 4b arranged on a switch board 3 by being separated from each other with a predetermined space; and the tact switch 5 mounted between the input button 2 and the electrodes 4a and 4b for electrically connecting the electrodes 4a and 4b to each other by depressing the input button 2. A projection part 7 for electrically connecting the two electrodes 4a and 4b through the tact switch 5 by depressing the input button 2 is formed nearly at the center of the upper surface of the tact switch 5.