An amino acid degradation odor-inhibiting agent which is capable of effectively inhibiting a degradation odor of an amino acid, and an amino acid-containing food or drink. The amino acid degradation odor-inhibiting agent contains an ester compound represented by formula (I) as an active ingredient. The amino acid-containing food or drink contains the ester compound. (In formula (I), when R1 is a methyl group, R2 is a C4-C7 alkenyl group and when R1 is an ethyl group, R2 is a C2-C3 alkyl group or a C4-C7 alkenyl group.)