To provide a multilayered syringe barrel for a prefilled syringe which is excellent in oxygen barrier property and suppressed whitening after storage for a certain period in a state filled with a chemical liquid, a syringe and a prefilled syringe.A layer (X) having as a main component a cycloolefin polymer having a glass transition temperature lower than 100 C. and a layer (Y) containing a polyamide resin (A) as a main component,Wherein the polyamide resin (A) is composed of a diamine-derived constituent unit and a dicarboxylic acid-derived constituent unit, 70 mol% or more of the diamine-derived constituent units are derived from m-xylylenediamine, and the dicarboxylic acid-A multilayer syringe barrel for a prefilled syringe in which 30 to 60 mol% of the constitutional units are derived from an , -linear aliphatic dicarboxylic acid having 4 to 20 carbon atoms and 70 to 40 mol% is derived from isophthalic acid.BACKGROUND OF THE INVENTION【課題】 薬液を充填した状態で一定期間保存した後の、酸素バリア性に優れ、かつ、白化が抑制されたプレフィルドシリンジ用多層シリンジバレル、ならびに、シリンジおよびプレフィルドシリンジの提供。【解決手段】 ガラス転移温度が100℃より低いシクロオレフィン系ポリマーを主成分とする層(X)およびポリアミド樹脂(A)を主成分とする層(Y)を有し、前記ポリアミド樹脂(A)が、ジアミン由来の構成単位と、ジカルボン酸由来の構成単位から構成され、前記ジアミン由来の構成単位の70モル%以上がメタキシリレンジアミンに由来し、前記ジカルボン酸由来の構成単位の30~60モル%が炭素数4~20のα,ω-直鎖脂肪族ジカルボン酸に由来し、70~40モル%がイソフタル酸に由来するプレフィルドシリンジ用多層シリンジバレル。【選択図】図1
