Unit connecting mechanism and image display device

A unit connecting mechanism and box-like unit is disclosed having an engaging unit ( 4 ) and a connecting pin ( 3 ) which are mounted to the box-like unit ( 1 ) to allow a plurality of box-like units ( 1,1 ) to be coupled to one another in a vertical direction. A handle ( 44 ) is operatively connected to a hook ( 43 ) to catch an engaging rod ( 3 a) and is vertically raised to cause a stopper ( 45 ) to lock the hook ( 43 ) and the engaging rod ( 3 a) in a locked condition, with operation of the handle ( 44 ) causing the stopper ( 45 ) to move downward to cause the hook disengage from the engaging rod for thereby uncoupling the box-like units ( 1,1 ) from one another. As a result, the unit connecting mechanism can be manufactured in a compact structure, providing a capability for a worker to easily and appropriately perform coupling and uncoupling operations of the box-like units.