Vehicle door glass assembly and method for regulating position of door glass

A vehicle door glass assembly capable of regulating a position of a door glass, comprising:

• a door frame forming a vehicle door;
• a garnish joined to a periphery of the door frame to finish an outer side face of the door frame;
• the door glass installed so as to be raised or lowered within the door frame;
• a glass run assembled to the door frame to support a periphery of the door glass;
• and
• a slider installed in an inner side face of the door glass to guide a raising or lowering movement of the door glass,
• wherein the garnish is provided with a restraint device configured to prevent the slider from moving in a longitudinal direction of a vehicle,
• wherein the restraint device is a fixing protrusion protruding from a position adjacent to the door glass in the garnish so as to direct toward an inside of the vehicle and restraining one side of the slider;
• wherein the glass run comprises a fastening part to be fastened to the door frame and a body part formed integrally with the fastening part, and wherein the fastening part is made of a material harder than a material of the body part;
• and
• wherein an airtight part extends from the fastening part along the outer side of the vehicle and contacts the end portion of the door glass, and a fixing hole through which the fixing protrusion penetrates is formed in the airtight part.