Automobile door sash structure

An automobile door sash structure comprising:

• a window glass arranged inside a window frame;
• a rail part forming a part of the window frame, and surrounding an outer edge of the window glass;
• a mall forming a part of an outer wall of the rail part;
• a window frame main body forming a part of an inner wall of the rail part;
• a run channel arranged inside the rail part;
• and
• a mall assembly body including the mall and the run channel which are assembled into a single unit, wherein
• the run channel includes
• an inner wall part which forms the inner wall of the rail part in collaboration with the window frame main body, and
• a bottom part which forms a bottom portion of the rail part in collaboration with the window frame main body, and
• a total dimension of a dimension of the inner wall part in a frame inside-outside direction and a dimension of the bottom part in a vehicle inside-outside direction is set longer than a dimension of the window frame main body in the frame inside-outside direction.