Wire harness fixing structure and wire harness

A wire harness fixing structure, comprising:

• a plate-like member including a first layer and a second layer and interiorly mounted on a vehicle, the second layer stacked on a first main surface of the first layer and softer than the first layer;
• and
• a wire harness including an electrical wire disposed along the plate-like member and a fixing member attached to the electrical wire to fix the electrical wire to the plate-like member, wherein
• the fixing member includes:
• a through locking piece in which a tip portion is formed into a shape of being able to pass through a portion in the first layer where a hole is not formed from a second main surface at an opposite side of the first layer from the first main surface and is locked to the first main surface while passing through the first layer;
• a regulation piece provided with a space between the regulation piece and the through locking piece to stop the through locking piece from passing through a surface of the plate-like member;
• and
• a column connecting the through locking piece and the regulation piece.