An electronic device having a mechanical structure that prevents a contact failure in an electronic device having a contact structure between a battery and a power terminal is provided. The electronic device includes a case including a battery mounting part, in which a battery is mounted, a terminal part formed on a first side wall of the battery mounting part to provide an elastic force directed to a second side wall opposite to the first side wall, to the battery, and a tension part formed on the second side wall of the battery mounting part to provide an elastic force directed toward the first side wall.