Abstract: A seat belt of a vehicle including an air belt to stably and reliably protect an occupant during a vehicle crash. The seat belt includes a cover made of a fabric material, upper and lower webbings respectively fixed to opposite ends of the cover, a D-ring fixed to the upper webbing and arranged within an occupant compartment of the vehicle, a retractor fixed to the lower webbing to wind and unwind the lower webbing; and an air belt to rapidly supply a high-pressure gas into a bag held in the cover during a vehicle crash, and thus, to inflate the bag. Since the bag is covered by the fabric cover, an improvement in wearing comfort is achieved.

Abstract: A roller D-ring for a seat belt of a vehicle including a cylindrical roller, and a body having a folded structure to hold the roller by a folding portion of the body while allowing the roller to be rotatable. The folded structure is formed in a state in which the roller is seated on the folding portion of the body. The body defines, together with a peripheral surface of the roller, a gap, through which a webbing of the seat belt passes. Since the roller D-ring includes only two constituent elements, that is, the body and the roller, it is possible to reduce the manufacturing costs in accordance with a reduced number of constituent elements.