To provide a deodorizer to which an attachment plug is attached integrally, which is small enough to use only by inserting the attachment plug in a socket on a wall at home or the like, and improves deodorizing performance of a deodorizer even without a fan.

By intermittently applying high frequency voltage to a flat plate type creeping discharge element having a heater to cause creeping discharge, ozone, active species, and ultraviolet light are generated. By activating with the ultraviolet light a photocatalyst of a thin panel supporting the photocatalyst installed opposite the creeping discharge element, more effective deodorization is achieved.