PROBLEM TO BE SOLVED: To provide an epoxy resin composition which has a low viscosity, cures in a short time even under low temperature conditions, has a low glass transition point (Tg), and gives a cured product having excellent moisture resistance and reliability after curing. SOLUTION: A thiol-based curing agent containing at least one polyfunctional thiol compound having three or more thiol groups; (B) at least one polyfunctional epoxy resin; (C) at least one fragrance. A cross-linking density modifier containing a group monofunctional epoxy resin; and (D) a curing catalyst, the ratio of the epoxy functional group equivalent for the component (B) to the thiol functional group equivalent for the component (A) ([epoxy]. Functional group equivalent] / [thiol functional group equivalent]) is 0.40 or more and 0.70 or less, and the epoxy functional group equivalent for the component (C) and the thiol functional group equivalent for the component (A). An epoxy resin composition having a ratio ([epoxy functional group equivalent] / [thiol functional group equivalent]) of 0.10 or more and 0.55 or less. [Selection diagram] None
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