A supporting device for supporting a main component and an electronic apparatus using the same are provided. The supporting device comprises a holder, a connecting unit and an engaging unit. The holder is placed on a surface. The connecting unit is disposed immovably on the holder. The engaging unit is disposed immovably on the main component and able to be lodged in or separated from the connecting unit, so that the main component is lodged in or separated from the holder. The engaging unit comprises an actuator and a movable lock. The actuator is able to move the movable lock, so that the movable lock is lodged in or separated from the connecting unit. The movable lock comprises a restricting unit for restricting the movement of the actuator.