The invention relates to a keyboard which is used for being arranged on a portable electronic device and comprises a printed circuit board, a plurality of membrane switches, a touch sensitive panel, a light transmission membrane and a key group, wherein the membrane switches are arranged on one surface of the printed circuit board; the touch sensitive panel is positioned above the membrane switches and comprises a first sensitive region and a second sensitive region; the light transmission membrane is arranged on the touch sensitive panel; the key group is arranged on the light transmission membrane and comprises a plurality of first keys and a plurality of second keys; the positions of the first keys and the second keys respectively correspond to the positions of the membrane switches; apart of the first keys are positioned above the first sensitive region; and a part of the second keys are positioned above the second sensitive region.