PROBLEM TO BE SOLVED: To provide an anti-fatigue agent including an albumen hydrolysate, from which a sulphurous odor characteristic of albumen is reduced, as an active ingredient.SOLUTION: An anti-fatigue agent includes an albumen hydrolysate, in which a degree of separation is 5 to 40 and the average molecular weight is 200 to 1,500, and the content of hydrogen sulfide is ≤2 ppm, as an active ingredient.