To provide an electrode for electrolysis capable of stably generating active oxygen species for a long time and an active oxygen species generator using the electrode for electrolysis.

The electrode 1 for electrolysis for generating the active oxygen species such as ozone, OH radical or the like by the electrolysis of water includes an electrode base body 2 comprising Ti or the like, a conductive layer 3 formed on the electrode base body 2 and comprising Pt or the like and an insulating body layer 4 covering the conductive layer 3 and comprising Ta2O5 (tantalum) or the like and at least one side surface of the conductive body layer 3 is exposed from the insulating layer 4.