PROBLEM TO BE SOLVED: To stabilize ozone concentrations in an air blow-off port of an air cleaner and, in turn, ozone concentrations in a room in which the air cleaner is installed.SOLUTION: There is provided an air cleaner 30 which comprises a storage box 13 having an air blow-off port 11 and an air suction port 12, a blower fan 14 which is stored in the storage box 13 and blows air toward the air blow-off port 11, discharge devices 10A (10B) arranged on the blower fan 14 and a mesh 12a which is fitted to the air suction port 12 and provided with an ozone decomposition catalyst, wherein ozone generated by the discharge devices 10A (10B) is sent with air from the air blow-off port 11 to the outside. The discharge devices 10A (10B) comprise a first pipe 1 made of an insulator, an inner electrode 2 arranged along the inner surface of the first pipe 1, an outer electrode 3 arranged along the outer surface of the first pipe 1 and voltage application means 4 for applying alternating voltage between the inner electrode 2 and the outer electrode 3.SELECTED DRAWING: Figure 3【課題】 空気清浄機の空気吹出口におけるオゾン濃度、ひいては空気清浄機が設置された部屋内のオゾン濃度をより安定させる。【解決手段】 空気清浄機３０は、空気吹出口１１及び空気吸入口１２を有する収納箱１３と、収納箱１３に収納され、空気吹出口１１に向けて送風する送風ファン１４と、送風ファン１４上に配置された放電装置１０Ａ（１０Ｂ）と、空気吸入口１２に取り付けられ、オゾン分解触媒が被着されたメッシュ１２ａとを備え、放電装置１０Ａ（１０Ｂ）により発生されたオゾンを空気に乗せて空気吹出口１１から外部に送出する。放電装置１０Ａ（１０Ｂ）は、絶縁体からなる第１の管１と、第１の管１の内面に沿って配置された内電極２と、第１の管１の外面に沿って配置された外電極３と、内電極１と外電極３との間に交流電圧を印加する電圧印加手段４と、を備える。【選択図】図３
