PROBLEM TO BE SOLVED: To provide an identification of a novel allergen component derived from egg, to provide a prophylactic agent, therapeutic agent, or test agent of egg allergic disease, the agents containing the novel allergen derived from egg, and to provide a diagnostic method of egg allergic disease, and the like.SOLUTION: Disclosed are the following peptides (a) and (b): (a) a polypeptide consisting of amino acids represented by a specific sequence； and (b) a polypeptide consisting of an amino acid sequence including substitution, deletion, insertion, and/or addition of one or some amino acids in an amino acid sequence represented by a specific sequence, having allergen activity.SELECTED DRAWING: None【課題】卵由来の新規アレルゲンコンポーネントの同定、卵由来の新規アレルゲンを含む、卵アレルギー性疾患の予防薬、治療薬又は検査薬、及び、卵アレルギー性疾患の診断方法等の提供。【解決手段】以下の（ａ）または（ｂ）のポリペプチド：（ａ）特定の配列で表されるアミノ酸からなるポリペプチド；（ｂ）特定の配列で表されるアミノ酸配列において、１または数個のアミノ酸が置換、欠失、挿入、及び／又は付加されたアミノ酸配列からなり、かつ、アレルゲン活性を有するポリペプチド。【選択図】なし
