To provide an active energy ray curing adhesive for a bonding optical disk with which no bubble is mixed into an adhesive layer of a bonded optical disk and bonding can be performed at low temperature and at high speed and which is suitable for obtaining the optical disk with bonded structure having excellent durability.

The active energy ray curing adhesive for bonded optical disk contains a photopolymerization initiator having an optical absorption spectrum in 400 to 450 nm visible light region and used for obtaining the optical disk having a structure wherein two disk substrates at least one of which has an optical information recording layer are bonded to each other with the recording inner side by using the active energy ray curing adhesive.