PURPOSE: To obtain the titled composition, consisting essentially of an epoxy resin, specific hydrazide compound and dibasic acid, having improved stability at ordinary temperature, rapidly curable at a relatively low temperature in heating and capable of giving curd articles having excellent flexibility.

CONSTITUTION: A composition consisting essentially of (A) an epoxy resin, (B) eicosanedioic acid dihydrazide expressed by formula I and/or 8,12- eicosadienedioic acid dihydrazide expressed by formula II and (C) a dibasic acid, e.g.oxalic acid, phthalic acid, diglycolic acid, etc., preferably having a carbon chain with an even number of carbon atoms.