A switch structure of an automatic external defibrillator including a housing member and a flap member for covering the housing member, open and closed states of the flap member and ON and OFF of a switch of the automatic external defibrillator which are associated with each other, the switch structure includes a movable unit for turning ON the switch when the flap member is in the open state and turning OFF the switch when the flap member is in the closed state and an operator performs further operation.