An electronic device is provided which firmly holds a battery pack at the time of mounting the battery pack, and can easily eject the battery pack at the time of ejection. When a battery pack 11 is housed in a battery compartment 21, and a cover 30 is slid from an attachment start position P1 to an attachment completion position P0 to cover the battery compartment 21, a regulation member 32 disposed on a rear surface 301 of the cover 30 is engaged with a battery pack locking claw 221 of a battery pack holding member 22, which locks an upper surface 11A of the battery pack 11. As a result, the movement of the battery pack holding member 22 in a direction of disengaging the battery pack locking claw 221 is regulated so that the battery pack 11 can be surely prevented from coming off from the battery compartment 21. Also, when the cover 30 moves to the attachment start position P1, the regulation member 32 is also moved and disengaged from the battery pack locking claw 221. As a result, the battery pack locking claw 221 of the battery pack holding member 22 can be moved in the disengaging direction, and the cover 30 is removed so that the battery pack 11 can be easily ejected.