Webbing guide device

A webbing guide device suitable for use in a vehicle seat belt system is disclosed. Both end portions of a rod-like member defining an annular webbing through portion, through which a webbing is allowed to extend, are overlapped with a slit formed therebetween with a clearance sufficient to permit insertion of the webbing from the outside into the through portion therethrough. At least one pair of holes are respectively formed in a face-to-face relation through the end portions so as to allow a fastening member to extend therethrough upon mounting the guide device. Owing to the provision of the slit, a previously-mounted webbing guide device can be replaced by the webbing guide device without need for removal of its associated seat belt system from the vehicle. Both end portions may define two or more pairs of holes for mounting the guide device at a suitable position in accordance with the physical constitution or the like of each user.