PROBLEM TO BE SOLVED: To provide a curing agent for an epoxy resin and an epoxy resin which are excellent in a balance between storage stability at room temperature to about 40 ° C. and curability at the time of heating and can be suitably used as a curing agent for a one-component epoxy resin composition. To provide a composition and a cured product thereof. An imidazole compound (A) and one or more compounds (B) selected from the group consisting of a fatty acid metal salt (B1), a fatty acid borate metal salt (B2) and an aluminum chelate compound (B3) are contained. An epoxy resin curing agent is used. [Selection diagram] None
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