To provide an athletic ability-improving agent and a muscle-maintaining agent, containing Ganoderma lucidum, in more details, a muscle-maintaining agent having as a muscle maintaining action, a muscle formation-promoting action, or a muscular atrophy-inhibiting action, or both actions of muscle formation promotion and muscular atrophy inhibition, and a food composition for maintaining muscles, containing a muscle-maintaining agent.SOLUTION: The invention has an athletic ability-improving action, a spontaneous momentum-improving action, and a muscle-maintaining action so as to be used for food, quasi-drugs, medicines, animal feed for domestic animals and pets aiming the actions. Further, Ganoderma lucidum has both actions of muscle formation promotion and muscular atrophy inhibition so as to be used as an extremely excellent muscle-maintaining agent, a muscle-maintaining food composition containing a muscle-maintaining agent, or animal feed.SELECTED DRAWING: None
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