An electronic device includes: a main unit; a cap unit that is capable of having a portable electronic device attached thereto; an instructing unit that issues an instruction to designate a tilt angle of the cap unit with respect to the main unit; a driving unit that drives the cap unit in accordance with the instruction from the instructing unit; and a controlling unit that controls the operation of the driving unit in accordance with the instruction from the instructing unit, when the portable electronic device is not attached to the cap unit.