Key, keyboard and terminal device

The utility model provides a key. The key comprises a key cap, a buffer piece and an elastic element, the buffer piece is arranged on one side of the keycap; the elastic element is located on the side, away from the keycap, of the buffer and comprises a first part, a second part and a third part, the second part is connected with the first part and the third part, the first part is located on the side, close to the keycap, of the second part, and the third part is located on the side, away from the keycap, of the second part; wherein the projection of the second part on the keycap is at least partially overlapped with the projection of the buffer piece on the keycap. According to the key, the buffer piece is arranged on the key cap and located in the projection area of the second part of the elastic element on the key cap, direct impact and friction between the elastic element and the key cap are prevented, the abrasion possibility of the elastic element is reduced, the service life of the elastic element is