An object of the present invention is to provide a curable resin composition capable of being quickly cured at a low temperature by irradiation of an active energy ray such as light and having excellent storage stability, and a curing method. Furthermore, in the curable resin composition of the present invention, which uses a component (D) in combination, the active energy ray curability is more improved. Provided is a curable composition containing components (A) to (C) described below: the component (A) being a compound having 2 or more glycidyl groups in the molecule; the component (B) being a compound having 2 or more thiol groups in the molecule; and the component (C) being a photobase generating agent containing a salt having an anion expressed by the following general formula (1);