Abstract: An electrostatic precipitator includes: a casing attached to a housing a fixing member a supporter a device body supported by the supporter and is detachably attached to the supporter; and a hook member supporting the device body. The device body includes a handle protruding in a first direction and a pair of protrusions protruding from both end side surfaces of the delivery body in a second direction, the supporter includes a pair of first support portions respectively supporting the pair of protrusions by hooking the pair of protrusions, the hook member includes a hook portion supporting the handle the handle includes a pair of extending portions protruding in the first direction and a grip portion connecting the extending portions, the hook portion supports the grip portion from below, and the hook member is attached to the supporter so as to be slidable in the first direction.