A power feeding wiring structure includes a protection tube for wires, a slide door side fixing device adapted to fix one end of the protection tube, and a vehicle body side fixing device adapted to fix the other end of the protection tube. The slide door side fixing device includes a restricting portion for restricting a moving range of the protection tube by being pivoted about a rotary shaft, and a biasing portion for rotating the restricting portion in a biasing direction. A center line along a length direction of the restricting portion is located in an area at a front side in the biasing direction with respect to a first plane defined by the position of a leading end of the restricting portion and the rotary shaft, whereby the leading end of the restricting portion projects out from the slide door when the slide door is opened and closed.