A mounting structure for an automotive exterior member includes a mounting portion projecting from a rear side of a lower garnish so that a clip engaged by an outer panel of a tailgate is retained by the mounting portion. The mounting portion includes a base end portion on the side of the main body of the lower garnish and a projecting end portion on the side of the outer panel connected to the base end portion via a connecting portion which ruptures at the time of a crash at the lower garnish. The base end portion and the projecting portion are displaced along the projecting direction at the time of a crash. Therefore, a non-serious crash does not cause the base end portion to abut the outer panel or the projecting end portion to abut the main body of the lower garnish, and damage is limited to the deformation of the exterior member.