An electrically-heated window sheet material comprising: a heatable transparent conductive film; and a plurality of bus bars (13, 14) for supplying electricity to the transparent conductive film; wherein the plurality of bus bars (13, 14) include a left bus bar connected to a left edge of the transparent conductive film, and a right bus bar connected to a right edge of the transparent conductive film; wherein the transparent conductive film includes a band-shaped first region interposed between the left bus bar and the right bus bar, a band-shaped second region interposed between the left bus bar and the right bus bar, and a plurality of openings provided in the first region; wherein a distance between the left bus bar and the right bus bar is shorter in the first region than in the second region, wherein the second region does not include the openings, characterized in that the first region, by including the openings having a vertical dimension that is greater than or equal to a predetermined value, includes a frequency selective surface that allows a horizontally polarized electromagnetic wave of a frequency band of a predetermined frequency to be transmitted, and in that the plurality of openings include first and second openings (131, 132) that are arranged at spaced-intervals in a horizontal direction, and third openings that contact or overlap with regions that extend the first openings in the horizontal direction toward the second openings and regions that extend the second openings in the horizontal direction toward the first openings so that the plurality of openings are arranged in such a manner that a current flowing in the first region from one of the left and right bus bars (13, 14) to the other of the left and right bus bars (13,14) is bypassed at least once by the openings. a heatable transparent conductive film; and a plurality of bus bars (13, 14) for supplying electricity to the transparent conductive film; wherein the plurality of bus bars (13, 14) include a left bus bar connected to a left edge of the transparent conductive film, and a right bus bar connected to a right edge of the transparent conductive film; a left bus bar connected to a left edge of the transparent conductive film, and a right bus bar connected to a right edge of the transparent conductive film; wherein the transparent conductive film includes a band-shaped first region interposed between the left bus bar and the right bus bar, a band-shaped second region interposed between the left bus bar and the right bus bar, and a plurality of openings provided in the first region; wherein a distance between the left bus bar and the right bus bar is shorter in the first region than in the second region, wherein the second region does not include the openings, characterized in that the first region, by including the openings having a vertical dimension that is greater than or equal to a predetermined value, includes a frequency selective surface that allows a horizontally polarized electromagnetic wave of a frequency band of a predetermined frequency to be transmitted, and in that the plurality of openings include first and second openings (131, 132) that are arranged at spaced-intervals in a horizontal direction, and third openings that contact or overlap with regions that extend the first openings in the horizontal direction toward the second openings and regions that extend the second openings in the horizontal direction toward the first openings so that the plurality of openings are arranged in such a manner that a current flowing in the first region from one of the left and right bus bars (13, 14) to the other of the left and right bus bars (13,14) is bypassed at least once by the openings.