An electrode device for forming a dielectric barrier / plasma discharge between the plane (4) and a surface to be treated that collects fluid and functions as a counter electrode, the connector being connectable to a high voltage source by a connector A planar electrode (14) completely embedded in a planar dielectric (2) other than the above, and the dielectric (2) is a top surface (1) and a bottom surface (4) which is a plane facing the surface to be treated An electrode device is provided. The planar electrode (14) has a plurality of through holes (15) arranged over the entire surface, and the dielectric (2) completely covers the planar electrode (14) even in the region of the through holes (15). The dielectric (2) has a size smaller than the through-hole (15) of the planar electrode (14), and the dielectric (2) forms a straight line with the through-hole (15) of the planar electrode (14). With the simple configuration of having a plurality of through holes (3) extending from the lower surface portion (4) to the upper surface portion (1), the electrode device enables discharge or supply of fluid.その平面（４）と、流体が集まり対向電極として機能する被処理表面との間に誘電体バリア・プラズマ放電を形成するための電極装置であって、コネクタにより高電圧源と接続可能な前記コネクタ以外の平面誘電体（２）に完全に内蔵された平面電極（１４）を含み、前記誘電体（２）が上面部（１）と、前記被処理表面に向く平面である下面部（４）を形成する電極装置が提供される。前記平面電極（１４）がその全面に渡り配された複数の貫通孔（１５）を有し、前記誘電体（２）が前記貫通孔（１５）の領域においても前記平面電極（１４）を完全に覆うように、前記誘電体（２）が、前記平面電極（１４）の前記貫通孔（１５）と直線をなし前記平面電極（１４）の前記貫通孔（１５）より小さい寸法を有し前記下面部（４）より前記上面部（１）まで延びている複数の貫通孔（３）を有するという簡単な構成によって、前記電極装置は流体の排出又は供給を可能にする。
