PROBLEM TO BE SOLVED: To provide a discoloration inhibitor capable of inhibiting discoloration of red peculiar to red-fleshed fish meat even if non-heated red-fleshed fish meat and a processed product thereof are stored at normal temperature.SOLUTION: There are provided the discoloration inhibitor for red-fleshed fish meat including cystines and polyphenols, and a red-fleshed fish meat and processed product including the discoloration inhibitor.COPYRIGHT: (C)2012,JPO&INPIT【課題】非加熱の赤身魚肉およびその加工品を常温に保管しても、赤身魚肉特有の赤色の退色を抑制することができる退色抑制剤を提供することである。【解決手段】シスチン類およびポリフェノール類を含有することを特徴とする赤身魚肉用退色抑制剤。【選択図】 なし