To realize very stable retention in such a way that an end of a discharge wire is wound at a hook part of a tension spring in a specific wound state so as not to apply excessive stress to the discharge wire.

In a wire for corona-discharging having the tension spring at at least one side end part for tensively laying at a corona discharge apparatus, the wire is held against the hook part of the tension spring such that both a wire body part for discharging and a free end for winding are held in a wound state. The corona discharging apparatus is characterized in that the hook of the discharging wire is hung on an electrode provided within an end block, further in that, for winding, the corona discharging wire is wound being maintained at the hook part of the tension spring at an angle of about 100 to 140 degree.