The invention discloses a key structure and a keyboard structure. The key structure comprises a base board, a keycap, an elastic body, a first supporting member, a second supporting member and a press part, wherein the elastic body, the first supporting member and the second supporting member are arranged between the base board and the keycap, the first supporting member and the second supportingmember are mutually connected and are respectively connected with the base board, meanwhile, the first supporting member and the second supporting member are respectively provided with a first connection point and a second connection point which are connected with the keycap, and the press part is arranged between the first connection point and the second connection point and abuts the elastic body. When the keycap is pressed, the keycap applies force to the first supporting member and the second supporting member through the first connection point and the second connection point to lead the press part to press the elastic body. The key structure and the keyboard structure are suitable for low-stroke keys.