Power supply path and power supply system having the same

A power supply circuit through which width dimension of the power supply circuit can be suppressed to be small and width dimension of a holding member is suppressed to be small, and a power supply system provided with the power supply circuit are provided. The power supply circuit comprises a wire member, a cover member and a held part. The wire member includes at least one electrically conductivecore wire extending along the left-right direction. The cover member is electrically insulated, and has a first surface and a second surface at two sides of the front-back direction. The cover memberaccommodates the wire member into an opening part formed in the first surface. The held part protrudes from the second surface of the cover member along the front-back direction, and can be held by the holding member from two sides at the vertical direction. Two end surfaces at the vertical direction of the held part are inside two end surfaces (namely an upper surface and a bottom surface) at the vertical direction of th