Structure of coupling vehicle body exterior parts to each other

The present invention provides a structure of coupling vehicle body exterior parts to each other, in which first and second exterior parts 3, 4 secured at their one-ends to spaced-apart portions of the vehicle body 1 are coupled at the other opposed ends to each other for sliding movement in a given direction A. In this structure, first and second support walls 20, 20'; 24, 24' are provided on the first and second exterior parts 3, 4 to abut against each other for sliding movements in the given direction A; and U-shaped grooves 22, 26 are formed in the first support walls 20, 24 to extend in the given direction A, and T-shaped protrusions 23, 27 are formed on the second support walls 20', 24', so that their necks are slidably fitted in said U-shaped grooves 22, 26. Thus, a high rigidity can be provided to relatively slidable coupled portions of the first and second exterior parts, so that the displacement between the exterior parts can be prevented.