A multifunction key includes a key member, a conductive member, and a circuit baseboard. A portion of the key member extends out from a shell of an electronic device; the conductive member is fixed on a bottom of the key member. The conductive member includes a first protrusion member and a second protrusion member. One surface of the circuit baseboard includes a conductive layer and a resistance layer respectively contacting the first and the second protrusion member. Another surface of the circuit baseboard includes a first and second conductive terminal respectively connected to the conductive layer and the resistance layer. The conductive layer, resistance layer, first and second conductive terminal, conductive member, and an internal circuit of the electronic device form a circuit loop. When the key member moves, a resistance value of the resistance layer within in the circuit loop is changed and produces a corresponding key command.