To provide an optical film and antireflection film including an antistatic layer that has high film strength, high hard coat property, high transparency, high antistatic property, high heat resistance, high moist heat resistance, and high light resistance, to provide a polarizing plate using this, and to provide an image display device.

This optical film includes at least one antistatic layer formed by curing a composition containing at least the following (A) to (D) on a transparent support: (A) an electrically conductive polymer; (B) a polyfunctional monomer having two or more polymerizable groups; (C) specific compound; and (D) a photopolymerization initiator.