To provide a door structure capable of preventing a door opening and closing trouble from occurring due to inhibit of function of a torsion coil spring even when the structure is used for a long period of time.

An opening part 114 is provided at the end part of a guide frame 112 into which a connector is inserted, and a door 116 closing the opening part 114 is installed. A cylindrical projected part 118 is extended to the end face of the door 116 on the rotating center line of the door 116, and the projected part 118 is covered by a cylindrical closed tube part 122. A coil part 130 of a torsion coil spring 128 is inserted from the tip side of the projected part 118 into a clearance 120 between the projected part 118 and the closed tube part 122, and engaged with the projected part 118. One end of the torsion coil spring 128 is locked to a side face 133 of the guide frame 112, and the other end of the torsion coil spring 128 is locked to the side face of the door 116.