An electronic device includes a first unit having an input part and a second unit having a display. The first unit and the second unit are detachably coupled. The first unit includes a socket capable of housing a predetermined side of the second unit. Locked holes, into which a lock projection of a lock member can be inserted, are provided on one of right and left sides of the socket and the second unit. An interlocking lock mechanism is provided on another of the right and left sides of the socket and the second unit. The interlocking lock mechanism locks the second unit to the socket when the lock projection of the lock member is inserted into the locked holes.