A latch unit is mounted on an electronic device having first and second housings. The latch unit includes a hook member for interlocking the first and second housings. The hook member is mounted in the first housing and has opposite first and second engaging ends. The first engaging end projects from the first housing and extends into and releasably engages the second housing upon movement of the hook member to an engaging position when the first housing is positioned at a first transverse position. The second engaging end projects from the first housing and extends into and releasably engages the second housing upon movement of the hook member to the engaging position when the first housing is positioned at a second transverse position.