PROBLEM TO BE SOLVED: To provide highly safe natural antioxidants of which the raw material can be easily available having at least any one of a superoxide dismutase (SOD)-like action, an inhibitory action of membrane lipid peroxidation by singlet oxygen, a hydrogen peroxide eliminating action, and a radical eliminating effect and the like.SOLUTION: An obesity dissolution agent, a lipolysis promoter, a cyclic AMP-phosphodiesterase activity inhibitor, and a lipolysis promoter for rat epididymis adipocytes contain an extract of black ginger, and have at least any one of an obesity dissolution action, a lipolysis promoting action, a cyclic AMP-phosphodiesterase activity inhibiting action, and a lipolysis promoting action for a rat epididymis adipocyte lipolysis.