To improve appearance, etc., at the time of using a door harness protector.

It is constituted by providing a connector 4 of a harness 3 on the side of a car body main body free to revolve, inserting a door harness 8 in the inside of a protector 9, arranging a connecting connector 10 against the connector 4 on one end of the protector 9 and engaging the other end of the protector 9 with the inside of a door free to slide, the connector 4 is provided on a door fitting inwall 2 of a vehicle body main body 1, positioned between each of weather strips 11, 12 on the door side and on the vehicle body main body side, and each of the connectors and the protector 9 are perfectly hidden from the indoor side at the time of closing the door. The protector 9 has a pair of slide pins in the vertical direction, and a slide guide 7 in the door has a guide groove 27 free to store the protector 9 and a pair of guide holes in the horizontal direction communicated to the guide groove 27 and free to engage with the slide pins. The slide guide 7 is provided by fitting it in a groove 33 of a door inner panel 6.