Door armrest structure of vehicle

A door armrest structure of a vehicle as a door armrest structure provided to a door internal panel configuring a door for opening or closing a door opening formed in a vehicle body and a door trim covering the door internal panel, the door armrest structure comprising:

• an armrest pivot including a first end portion rotatably coupled to the door internal panel, and a second end portion extending into the vehicle body through the door trim;
• an armrest including a first end portion connected to the second end portion of the armrest pivot and operating to be rotated according to rotation of the armrest pivot;
• a drive motor connected to the armrest pivot and operating to rotate the armrest pivot according to an opening signal or a closing signal of the door;
• and
• a supporting pin that supports the second end portion of the armrest to be fixed when the armrest rotates and forms an angle which is parallel to a bottom surface of the vehicle body.