A discharge device, comprising: a power source; a discharge electrode having a plurality of discharge needles each being in a linear shape or a rod-like shape; and a counter electrode formed along the plurality of discharge needles, the discharge device providing a streamer discharge from a tip of each of the plurality of discharge needles toward the counter electrode as a result of receiving a potential difference applied to the discharge electrode and the counter electrode from the power source, wherein the plurality of discharge needles are arranged parallel to one another, the discharge electrode includes a plate portion which extends in an arrangement direction of the plurality of discharge needles, the plurality of discharge needles each in a rod-like shape protrude laterally from a side edge of the plate portion, and the discharge electrode includes an electrode support member, wherein the electrode support member includes an intermediate portion which is arranged opposite the counter electrode with the plate portion interposed between the intermediate portion and the counter electrode, characterized in that said intermediate portion extends along the plate portion, that it further comprises a pair of support portions (91, 92) which protrude from both ends of the intermediate portion to the plate portion, and support the plate portion, and that the intermediate portion is arranged parallel to the plate portion and is spaced from the plate portion. a power source; a discharge electrode having a plurality of discharge needles each being in a linear shape or a rod-like shape; and a counter electrode formed along the plurality of discharge needles, the discharge device providing a streamer discharge from a tip of each of the plurality of discharge needles toward the counter electrode as a result of receiving a potential difference applied to the discharge electrode and the counter electrode from the power source, wherein the plurality of discharge needles are arranged parallel to one another, the discharge electrode includes a plate portion which extends in an arrangement direction of the plurality of discharge needles, the plurality of discharge needles each in a rod-like shape protrude laterally from a side edge of the plate portion, and the discharge electrode includes an electrode support member, wherein the electrode support member includes an intermediate portion which is arranged opposite the counter electrode with the plate portion interposed between the intermediate portion and the counter electrode, characterized in that said intermediate portion extends along the plate portion, that it further comprises a pair of support portions (91, 92) which protrude from both ends of the intermediate portion to the plate portion, and support the plate portion, and an intermediate portion which is arranged opposite the counter electrode with the plate portion interposed between the intermediate portion and the counter electrode, characterized in that said intermediate portion extends along the plate portion, that it further comprises a pair of support portions (91, 92) which protrude from both ends of the intermediate portion to the plate portion, and support the plate portion, and that the intermediate portion is arranged parallel to the plate portion and is spaced from the plate portion.