BUCKLE DEVICE

A buckle guide (42) formed in the shape of a cross-sectionally rectangular tube is inserted from a vehicle rear and lower end portion of a buckle cover (56) of a buckle, and guide ribs (58) that project from an inner surface of the buckle cover (56) are in abutting contact with a rectangular guide surface (42A) that is an outer surface of the buckle guide (42). Because of this, swiveling of the buckle cover (56) relative to the buckle guide (42) is limited.