A sheet includes a conductive film, and bus bars including an upper and lower bus bars connected to upper and lower sides of the conductive film. The conductive film includes a recess, a first region between the upper bus bar and the lower bus bar, a second region that is another region between the upper and lower bus bars, and openings in the first region. The upper or lower bus bar is formed along a side of the conductive film including the recess. The first region is between a bus bar at which the recess is positioned and another bus bar facing the recess. A distance between the upper and lower bus bars is shorter in the first region than in the second region. The openings are formed in an upper or a lower part of the first region on a side of the another bus bar.