A keyboard includes a main board and at least one key structure positioned on the main board. The key structure includes a key switch and a key cap. The key cap is combined with the key switch. The key switch includes a key base and a shaft movably positioned on the key base. The keycap includes a main body and a cushion member. The main body is positioned on the shaft of the key switch. The main body is spaced apart from the contact surface of the key base. The main body is moved forward and backward relative to the key base with movement of the shaft. The cushion member is positioned at one side of the main body facing the contact surface. While the main body is moved to the contact surface, the cushion member abuts on the contact surface, so as to avoid the main body from hitting the key base directly, and hence minimizing the noise that is produced by the moving parts.