To easily receive a receiving plate portion of an inserting portion provided on an attaching object between a pair of clipping plates composing a clip, and to securely ensure a fit-in state.

This coupling structure comprises the clip 2 provided with the receiving plate portion 10 composing the inserting portion 1 of the attaching object 100 inserted in an attaching hole 201 opened on the attached object 200, and a pair of the clipping plates 20, 20 is fitted in while receiving the receiving plate portion 10 between them. The clip 2 has engaging arms 21 snapping at an insertion finishing position y to the attaching hole 201 of the inserting portion 1 to be engaged in the attaching hole 201, and plural projections 24, 24... are provided on the inside of the pair of clipping plates 20, 20. The receiving plate portion 10 is provided with a strip with protrusion portion 11 extending in an inserting direction x to the attaching hole 201, and with which the projections 24 are engaged as the receiving plate portion 10 is inserted between the pair of clipping plates 20, 20 of the clip 2.