To provide a photocurability-imparted α-cyanoacrylate which is insusceptible to curing inhibition on photocuring and does not cause yellowing of the cured products by light irradiation and such a problem that operators have a rash and has no problem on the working atmosphere and the operating process and, at the same time, has thixotropy suitable for forming braille points and braille figures and using in potting, fill bonding and the like.

The objective photocurable α-cyanoacrylate based composition comprises a photocurability-imparted α-cyanoacrylate and fine powder silica. The composition can further contain a trialkyl borate.