Key

The invention relates to a key, which comprises a bottom plate, a keycap, a lifting mechanism, a spring-back device, a first stop block and a second stop block. The lifting mechanism is arranged between the bottom plate and the key cap so as to drive the key cap to move up and down, and comprises a first plate-shaped bracket and a second plate-shaped bracket which are pivoted to the bottom plate and opposite to each other. The spring-back device is arranged between the first plate-shaped bracket and the second plate-shaped bracket, and comprises a first magnetic member and a second magnetic. The first magnetic member extends from the first plate-shaped bracket and corresponds to the second plate-shaped bracket on the bottom plate. A supporting and abutting part extends from the second plate-shaped bracket so as to support and abut under the first magnetic member. The first stop block and the second stop block are formed on the key cap, the first stop block is separated from and opposite to the tail section pa