Vehicle door sash structure

A vehicle door sash structure comprising:

• a door sash that forms a window opening and surrounds front and rear edges and an upper edge of window glass that is elevated or lowered within the window opening;
• an upright pillar sash constituting the door sash and extending in elevating/lowering directions of the window glass along one of the front and rear edges of the window glass, and including a main body located on the vehicle interior side with respect to the window glass and facing the interior-side of the window glass;
• and
• an elevating/lowering mechanism that operates elevating/lowering movement of the window glass by a driving force of a drive source,
• wherein the elevating/lowering mechanism includes:
• a slider secured to the window glass;
• a guide rail that guides the slider so as to be movable in the elevating/lowering directions;
• and a transmission member that transmits the driving force from the drive source to the slider,
• the slider, the guide rail and the transmission member are located between the main body of the upright pillar sash and the window glass in vehicle interior and exterior directions as viewed along the elevating/lowering directions of the window glass,
• the guide rail regulates movement of the slider in both vehicle interior and vehicle exterior directions, on a vehicle interior surface side of the window glass,
• the main body of the upright pillar sash has a bursiform cross section part which includes an open portion extending along the longitudinal direction of the upright pillar sash,
• the guide rail closes the open portion of the bursiform cross section part and is spaced apart from a bottom interior wall of the bursiform cross section part that is opposite the open portion, and
• the guide rail includes:
• a first section into which a sliding part provided on the slider is slidably inserted;
• and
• a second section that is offset with respect to the first section in inner and outer peripheral directions with the window opening defined as an inner peripheral side and that houses a transmission receiving part of the slider to which the driving force is transmitted from the transmission member.