The invention provides a support device which reduces storage space and when makes an electronic device centered when the device is inserted. The support device for detachably supporting a portable electronic apparatus includes a base body, a support column member standing from one end of the base body, a flap axially supported in the support column member turnably clamp the portable electronic apparatus between the flap and the support face, conical rollers attached to the flap, each conical roller having an outer periphery diameter enlarged from one end portion thereof, and an urging device provided between the support column member and the flap and urging the flap in a direction of approaching the base body. The flap includes an arm portion, and support shafts extending in a right-and-left width direction from a tip of the arm portion. The support shafts incline relative to the base body, and each conical roller is turnably supported on the support shaft such that a small diameter portion is located close to the arm portion.