Key fitting structure for instrument

The utility model discloses a button fitting structure for an instrument, which belongs to the technical field of instruments and comprises a contact carrier and a contact film coated above the contact carrier, a button seat is fixedly connected onto a film panel on the periphery of the contact film, a button protrusion is slidably connected into the button seat, and the button protrusion is fixedly connected with a button panel on the periphery of the contact film. The bottom of the key protrusion is located over the contact film and makes contact with the contact film, the top of the key protrusion is fixedly connected with a connecting plate, the bottom close to the outer edge of the connecting plate is fixedly connected with a sliding block, the sliding block is slidably connected with a sliding groove formed in the outer wall face of the key base, and a spring is connected between the end, away from the connecting plate, of the sliding block and the inner wall of the sliding groove. The limiting rod is s