An underfloor shielded harness (100) has a long conductive plate which is wound so as to have at least two internal spaces (104, 105) in a cross section taken perpendicularly to the longitudinal direction. High-voltage cables (102) is inserted in the internal space (104) of the conductive plate (103) and the low-voltage cable (101) is inserted in the internal space (105) that is different from the internal space (104) in which the high-voltage cables (102) is inserted. At least one of the two internal spaces (104, 105) communicates with the outside of the spaces (104, 105) formed by the conductive plate (103).