A seat belt webbing guide includes a main body having a slot through which seat belt webbing passes and a through hole through which a mounting bolt passes. The webbing guide includes at least one rib that is formed as a single unit with the main body along a circumferential surface of the through hole. The at least one rib extends inwardly in a radial direction of the through hole to a central axis of the through hole. At least a portion of the at least one rib is protruded from a surface of the main body toward a head of the mounting bolt.