DOOR MIRROR ATTACHING STRUCTURE OF VEHICLE DOOR

PROBLEM TO BE SOLVED: To provide a door mirror attaching structure of a vehicle door that can contribute to improvement in pillar rigidity without increasing the weight of a vehicle body and can downsize a window frame while ensuring attaching rigidity of a door mirror.SOLUTION: A part positioned in a door body 1a of a hinge side reinforce 25 has a front flange part 25a and a door inner sidewall part 25b. A part positioned from a belt line part L of the door body 1a of the hinge side reinforce 25 to interior of a front frame part 1d has a fastening flange part 25c, a door outer sidewall part 25d, and a window frame sidewall part 25g. A reinforcing member 26 is disposed at a part corresponding to the front frame part 1d of the hinge side reinforce 25. A closed cross-section box part 27 of which top and bottom are closed by the reinforcing member 26 and the hinge side reinforce 25 is formed.