This underfloor shielded harness (100) is provided with a long conductive sheet (103) that is rolled up so as to have at least two internal spaces (104, 105) in a cross-section perpendicular to the lengthwise direction thereof. High-voltage cables (102) are run through one of the internal spaces (104) of the conductive sheet (103), and a low-voltage cable (101) is run through an internal space (105) other than the internal space (104) through which the high-voltage cable (102) is run. At least one of said internal spaces (104, 105) connects to the outside of the spaces (104, 105) formed by the conductive sheet (103).