Provided is a lactone compound that is represented by formula (1) and is useful as a flavor imparting agent. Also provided are a flavor imparting agent and a fragrance composition. In the formula, the dotted line in the heterocycle indicates that one location is a carbon-carbon double bond, the dotted line in the side chain indicates that each of one or two locations is a double bond, n1 represents 1 or 2, n2 represents an integer from 1 to 4, and R1 and R2 each independently represent a methyl group or an ethyl group when n1=1, and each independently represent hydrogen, a methyl group, or an ethyl group when n1=2.

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