To provide a fitting structure of a roof molding capable of fitting a roof molding in a roof groove without damaging its appearance.

In a fitting structure 1 of a roof molding, a bracket 30 is provided on the bottom surface 92 in a roof groove 90, and a reception part 18 of the roof molding 10 is fitted to a projection piece 38 of the bracket 30, and while covering the end in the longitudinal direction of a head part 12 of the roof molding 10 with the end in the longitudinal direction of a cover part 22 of a lid member 20, the lid member 20 is engaged with the bracket 30, to thereby fit the roof molding 10 in the roof groove 90 in the sandwiched state on the end between the bracket 30 and the lid member 20.