An electronic device includes a housing, a circuit board, a switch, and a side key. The housing has a plurality of side walls. The circuit board is disposed in the housing. The switch is disposed at an inner surface of the housing relatively close to the circuit board. The side key disposes through one of the side walls, and the location of the side key is corresponding to the switch. When the side key is pressed, the side key contacts the switch to make the switch electrically connected with the circuit board.