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application/pdf, Cancer is one of the causes of death and is increasing year by year in Japan. So, demands for functional food increase for health maintenance to prevent cancer. Mushroom such as Phellinus linteus and Fuscoporia obliqua are known to be functional foods with anti-carcinogenic action. Because the growth of the mycelium is faster than that of the fruit body of the mushroom, radical scavenging activity, leading to causes of cancer initiation, was measured with those mycelial extracts. Mycelia of Phellinus linteus and Fuscoporia obliqua were cultured, and those aqueous extracts were prepared. As a result, it was found that Phellinus linteus mycelium had a higher antioxidant active ability than Fuscoporia obliqua mycelium. However, it was also found that the antioxidant active of those fruit body extracts was higher than those of mycelia extracts.