福岡県糸島市周辺で栽培されている農産物の抗酸化活性を評価した．本研究では，未利用資源の有効活用を視野に入れ，通常食されている部位の他，果皮や植物体残渣(葉，枝，根等)についても調査した．各農産物の凍結乾燥物から水抽出物およびエタノール抽出物を調製し， 各抽出物のORAC(Oxygen Radical Absorbance Capacity)値，DPPHラジカル消去活性値，鉄イオン還元能，総フェノール含量を測定した．その結果，果肉などの可食部位と比較して果皮や種といった非食部位の抗酸化活性が非常に高い値を示した．本研究の結果から，糸島の天然素材(農産物)，特に，あまおうの茎根，根，花など，現在廃棄されている未利用部位の抗酸化活性に着目した新規利用法の創出が期待される．Itoshima city has a temperate climate that is suitable for growing vegetables, fruits, and flowers due to the influence of the Tsushima Current. As a result, various agricultural products are grown in the region throughout the year. In this study, we investigated the antioxidant activity of agricultural products grown around Itoshima city. The activity not only of the edible part but also of by-products such as peal, leaf, branch, and root were evaluated. Water extracts and ethanol extracts were prepared from the freeze-dried materials of each agricultural product, and their oxygen radical absorbance capacity (ORAC), DPPH radical scavenging activity, ferromagnetic ion reducing power ability, and total phenolic contents were measured. Results showed that extract prepared from the by-products of the Amaou strawberry, including the stron, flower, and root showed extremely high activity among all samples. In the other fruits and vegetables tested, the extract prepared from by-products also showed higher activity than those of edible parts. These findings suggest possible new uses for the by-products of natural materials grown in the Itoshima region based on their potential bioactivities, and indicate the potential for development of a local industry based on healthy food and cosmetics.