To provide: a novel alkanethioic acid derivative which is capable of imparting characteristic scent or flavor to cosmetics or to food and beverages； and a perfume composition that comprises the pertinent compound as an active ingredient. Provided are 5-([1-alkoxy]ethoxy) alkanethioic acid S-alkyl represented by formula (1) and a perfume composition that comprises the 5-([1-alkoxy]ethoxy) alkanethioic acid S-alkyl represented by formula (1) as an active ingredient. (In formula [1], R1 is an alkyl group having 1 to 9 carbon atoms, R2 is an alkyl group having 2 to 4 carbon atoms, and R3 is a methyl group or an ethyl group.).本發明提供一種新穎烷硫代酸衍生物，可對香妝品或飲食品等賦予有特徵的香氣‧香味；及含有該化合物作為有效成分之香料組成物。一種5-[(1-烷氧基)乙氧基]烷硫代酸S-烷酯，其係以下述式(1)表示；以及一種香料組成物，其係含有下述式(1)所示之5-[(1-烷氧基)乙氧基]烷硫代酸S-烷酯作為有效成分。[式(1)中，R1表示碳數1~9的烷基，R2表示碳數2~4的烷基，R3表示甲基或乙基]。
