A D-ring assembly for an inflatable belt of a vehicle includes a patch bracket, in which a portion of the patch bracket supporting a D-ring is inclined forward with respect to a portion of the patch bracket fixed to a pillar of the vehicle; and the D-ring installed at the patch bracket to be rotatable in a left or right direction, so that the two-layer webbing is guided toward the front of a wearer, allowing a passenger to easily wear the webbing.