An electronic device includes a housing unit, an electronic module and a locking mechanism. The housing unit includes a first housing and a second housing that is coupled detachably to the first housing. The locking mechanism includes an operable member and a drive member. The drive member can prevent movement of the second housing relative to the first housing. The operable member is operable to release the second housing from the drive member. When the drive member is moved to a position whereat the second housing is released, it can be maintained in the position, so that a user doesn't have to maintain the position of the drive member through operation of the operable member when separating the second housing from the first housing.