Mechanical key for IC card

The utility model discloses a mechanical button used for an IC card. The adhesive tape comprises an adhesive layer, a protective layer arranged on the upper surface of the adhesive layer and a releaselayer arranged on the lower surface of the adhesive layer, at least one key metal dome is arranged between the protective layer and the bonding layer. Wherein the bonding layer comprises edges connected end to end and at least one extension part connected with the edges, the key metal dome is partially contacted with the extension part, and the edges of the bonding layer are respectively bonded with the edges, facing the key metal dome, of the protective layer and the edge of the release layer, so that a closed hollow air bag is formed among the protective layer, the bonding layer and the release layer. The mechanical key for the IC card is provided with the closed air bag, so that the strength of the key metal dome is enhanced, the hand feeling of the key is improved, and different requirements are met; the stru