PROBLEM TO BE SOLVED: To provide a moisture-retaining composition having excellent moisture-retaining effect.SOLUTION: This moisture-retaining composition contains an extract extracted from a freezed or refrigerated plant of Sesuvium portulacastrum family. In the moisture-retaining composition, the freezed or refrigerated plant of Sesuvium portulacastrum family is preferably a plant of Sesuvium portulacastrum family which is held at 10°C or lower for two or more hours.