To provide an external panel assembling apparatus for a microwave oven which achieves a higher working efficiency and a production efficiency, for example, further simplification of assembling and separation work in the production of equipment and in the after-care service and repairing by eliminating additional required processes in the use of clamp screws.

In an external panel assembling apparatus which is so arranged to detachably connect a back panel 30 and an outer panel 50, the back panel 30 and the outer panel 50 are mutually connected by a plurality of clips 200 adapted to be reduced in diameter by an elastic force during the passage thereof through a plurality of pairs of clip passage holes 34 and 54 formed at specified positions and then restored after the passage.