To provide a circadian rhythm adjusting agent derived from a plant belonging to the genus Zanthoxylum of the family Rutaceae, and to provide therapeutic agents and food and drink compositions and the like that contain the circadian rhythm adjusting agent.SOLUTION: Provided is a circadian rhythm adjusting agent for shortening the circadian cycle, which contains as an active ingredient the extract of leaves, flowers, fruits, pericarps, barks, and trunks of a plant belonging to the genus Zanthoxylum of the family Rutaceae. The extract contains hydroxy- beta -sanshool as an active ingredient and the circadian cycle is shortened by shortening the expression cycle of a clock gene. The circadian rhythm adjusting agent may be a food and drink composition for the prevention, alleviation, or treatment of sleep disorder or jet lag caused by circadian rhythm disturbances.SELECTED DRAWING: None

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