To provide a curing composition which has less polymerization inhibition by oxygen, and thus can be suitably used for polymerization in dental operation under a condition that oxygen is hardly blocked, resulting in reducing the amount of an unpolymerized remainder on a surface and improving a surface hardness.

The curing composition comprises (a) 100 pts. by mass of a radical polymerizable monomer containing 0.1-10% by mass of a long chain (meth)acrylate base monomer represented by CH2C(R1)COOR2(wherein R1is hydrogen or methyl, and R2is a long chain hydrocarbon group having a carbon number of 8-24), (b) 0.5-10 pts. by mass of water, (c) 0.1-10 pts. by mass of a surfactant, and (d) an effective amount of a radical polymerization initiator.

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