To provide a winged injection needle with a wing and a syringe needle which can not be used unless the wing portion is unfolded prior to use against the intention of a needle puncture operator and the hub and injection needle main body are retreated following the development To prevent.SOLUTION: The blade portion 4 of the bladed injection needle 1 is engaged with and retains the blade portion 4 in a folded state, whereby the development of the blade portion 4 and the backward movement of the hub 3 and the injection needle main body 2 accompanying the development are performed Restricting means (engaging claws) which is switched between a restricted state and a state in which the blade portion 4 is deployed and the hub 3 and the injection needle body 4 are allowed to move backward in accordance with the predetermined engagement releasing operation Section 4 k) is provided.(FIG.【課題】羽根付き注射針において、注射針穿刺作業者の意に反して使用前に羽根部が展開したり、該展開に伴ってハブ及び注射針本体が後退し、使用不能状態に陥ることを防止する。【解決手段】羽根付き注射針1の羽根部4には、該羽根部4を折り畳み状態に係合保持することで羽根部4の展開及び該展開に伴うハブ3及び注射針本体2の後退を規制する状態と、所定の係合解除操作に応じて羽根部4の展開及び該展開に伴うハブ3及び注射針本体4の後退を許容する状態とに切り換えられる展開・後退規制手段(係合爪部4k)が設けられる。【選択図】図3
