2-(phenylalkyloxyalkyl)pyridine derivative or a 2-(phenylalkylthioalkyl)pyridine derivative imparts, when added to food and drink or cosmetics as an active ingredient, a flavor of natural impression thereto; and in particular, when added to food and drink, the compound imparts an umami imparting or enhancing, a saltiness enhancing a sweetness enhancing, and in particular, when added to a milk or dairy product, a food or drink product containing a milk or dairy product, or a dairy replacement product, the compound provides a milk richness enhancing.