A curable composition comprising (A) a monofunctional monomer containing a (meth)acrylate group; (B) a polyfunctional monomer containing a (meth)acrylate group; (C) a acidic group and a (meth)acrylate group containing compound having at least one (meth)acryloyloxyl group; and (D) a trialkylboron or an oxide thereof.
