To provide a push-button mechanism having a good click feeling associated with a button operation, and never causing malfunction with a button operation.

In this push-button mechanism, a circuit board 5 and a concatenated button device 6 are installed in a casing provided with a front panel 2. The button device 6 has a base part 61 to be fixed to the front panel 2; a plurality of first arms 62 extending toward a plurality of windows 21 of the front panel 2, and a plurality of second arms 7 extending toward a plurality of tact parts 51 on the circuit board 5 are projected through an elastic deformation part on the base part 61; a push button 4 led out from each window 21 of the front panel 2 is mounted at a tip part of each first arm 62. One or two slits 64 for inserting ends of the circuit board 5 are recessively formed on both or one side of the base part 61 of the button device 6 by interposing the respective second arms 7.