A discharge unit comprising: a discharge electrode ; a counter electrode ; and a voltage supply section configured to give a potential difference between the discharge electrode and the counter electrode , wherein the discharge unit includes a resin-made insulating member which supports the discharge electrode and the counter electrode , the discharge electrode is configured as a metal material and includes: a plate-like electrode support plate ; and a plurality of discharge sections arranged along, and supported at, a side edge portion of the electrode support plate so as to be opposed to the counter electrode , and the insulating member includes a support which supports only a middle region of the electrode support plate between two outermost discharge sections of the plurality of discharge sections ; a fixing member which supports the discharge electrode by sandwiching the middle region of the electrode support plate between the fixing member and the insulating member ; and the fixing member is made of a conductive member having a flanged portion , the flanged portion being arranged opposite the counter electrode with the discharge sections interposed there between and covering the entire discharge sections , being electrically connected to the discharge sections and having a shape along the discharge sections . a counter electrode ; and a voltage supply section configured to give a potential difference between the discharge electrode and the counter electrode , wherein the discharge unit includes a resin-made insulating member which supports the discharge electrode and the counter electrode , the discharge electrode is configured as a metal material and includes: a plate-like electrode support plate ; and a plurality of discharge sections arranged along, and supported at, a side edge portion of the electrode support plate so as to be opposed to the counter electrode , and the insulating member includes a support which supports only a middle region of the electrode support plate between two outermost discharge sections of the plurality of discharge sections ; a fixing member which supports the discharge electrode by sandwiching the middle region of the electrode support plate between the fixing member and the insulating member ; and a plate-like electrode support plate ; and a plurality of discharge sections arranged along, and supported at, a side edge portion of the electrode support plate so as to be opposed to the counter electrode , and the insulating member includes a support which supports only a middle region of the electrode support plate between two outermost discharge sections of the plurality of discharge sections ; a fixing member which supports the discharge electrode by sandwiching the middle region of the electrode support plate between the fixing member and the insulating member ; and the fixing member is made of a conductive member having a flanged portion , the flanged portion being arranged opposite the counter electrode with the discharge sections interposed there between and covering the entire discharge sections , being electrically connected to the discharge sections and having a shape along the discharge sections . <EOS>