PROBLEM TO BE SOLVED: To suppress an inter-electrode distance between a discharge electrode and a counter electrode from not being kept optimally due to thermal shrinkage of a resin member.SOLUTION: In a discharge unit, at least one of a discharge electrode (70) and a counter electrode (60) comprises a metal electrode (60, 70), a resin member (41, 90) has a pair of resin-made support sections (49, 51, 92, 93) for holding both ends of an electrode body (61, 71, 72) of the metal electrode (60, 70) in a longitudinal direction, and a deformation suppression part (45a, 49b, 51b) for suppressing the electrode body (61, 71, 72) of the metal electrode (60, 70) from being deformed in a flexible manner even when the resin member (41, 90) thermally shrinks inside the resin member in a longitudinal direction is provided to at least one of the pair of resin-made support sections (49, 51, 92, 93).COPYRIGHT: (C)2016,JPO&INPIT【課題】樹脂部材の熱収縮に起因して放電電極と対向電極との間の電極間距離を最適に保てなくなることを抑制する。【解決手段】放電電極(70)と対向電極(60)の少なくとも一方は、金属電極(60,70)で構成され、樹脂部材(41,90)は、金属電極(60,70)の電極本体(61,71,72)の長手方向の両端を保持するための一対の樹脂製支持部(49,51,92,93)を有し、一対の樹脂製支持部(49,51,92,93)の少なくとも一方には、樹脂部材(41,90)が長手方向内方へ熱収縮しても、金属電極(60,70)の電極本体(61,71,72)が撓み変形するのを抑制する変形抑制部(45a,49b,51b)が設けられていることを特徴とする。【選択図】図15
