PROBLEM TO BE SOLVED: To provide a muscular glycogen accumulation promoter which can attempt to increase the muscular glycogen accumulation amount safely and readily without exercise and injury.SOLUTION: A muscular glycogen accumulation promoter contains a processing powder of Araliaceae Panax japonicus plant. The embodiment that the processing powder of Araliaceae Panax japonicus plant is obtained by acting a strong acid aqueous solution with a concentration of 0.01-4 mol/L to the Araliaceae Panax japonicus plant and performing hydrolysis treatment under presence of lower alcohol, and the embodiment that the Araliaceae Panax japonicus plant is Panax notoginseng are preferable.