To provide a heater panel to enhance heater specifications at low- temperatures.

According to the panel heater 22, a diagonal line is assumed in a glass substrate 23, and a transparent conductive film 24 for the respective panel heater is arranged in directivity so as to intersect this diagonal line. This transparent conductive film 24 for the panel heater is made to have a Z shape, and both end parts of the transparent conductive film 24 for the respective panel heaters are extendedly extended up to the near end of the glass substrate 23. Such plural transparent conductive films 24 for the panel heater are arranged and installed along the diagonal line, and patterning is carried out over almost the entire face of the glass substrate 23, and a bus bar 25a is formed on a substrate brim of one side of the diagonal line taken as the center, and a bus bar 25b is also formed on the substrate brim of the other side.