[Purpose] The present invention pertains to a discharge electrode plate on which an elongated discharge electrode for causing corona discharge is formed, and the purpose of the present invention is to extend the lifetime by reducing degradation caused by the corona discharge. [Configuration] The present invention is provided with: a heat-resistant plate formed of a heat-resistant material; and a discharge electrode formed by applying electrically conductive glass into an elongated groove formed in an elongated shape on the heat-resistant plate or by applying the electrically conductive glass on the heat-resistant plate in an elongated manner, followed by baking. The discharge electrode is formed of electrically conductive glass having electron conductivity to extend the lifetime by reducing degradation caused by corona discharge.