As no occurrence of The present invention metal piece, I forming the inner needle and the caulking pin of a synthetic resin with, and together with the pointed end of the inner needle is formed of a resin having a predetermined hardness, Do-cho portion following the tip portion of the inner needle is formed of a soft resin providing the indwelling needle is freely bent. A and the outer needle unit 2 comprising the outer needle hub that holds the outer needle 21 and the outer needle 21, the outer needle inner needle hub is mounted hub 32 and the inner needle hub 32 from the outer needle 21 In the indwelling needle 1 consisting of the inner needle 31 extending out of the outer needle through the inner from the inner needle unit 3 for at least comprising, together with the pointed end 31a of the inner needle 31 is formed by a high hardness resin What length portion 31b until the tip portion 31a of the inner needle 31 from the inner needle hub 32 is formed by a strong resin of bending moment.BACKGROUND 1【課題】金属片の発生がないように、内針及びカシメピンを合成樹脂で形成すると共に、内針の尖端部が所定の硬度を有する樹脂で形成されると共に、内針の尖端部に続く胴長部が柔らかい樹脂で形成されて屈曲自在である留置針を提供する。【解決手段】外針21及び外針21を保持する外針ハブを具備する外針部2と、外針ハブが装着される内針ハブ32及び内針ハブ32から外針21内を貫通して外針外に延出する内針31とを少なくとも具備する内針部3とからなる留置針1において、内針31の尖端部31aが、硬度の高い樹脂によって形成されると共に、内針ハブ32から内針31の尖端部31aまでの胴長部31bが、曲げモーメントの強い樹脂によって形成される。【選択図】図1
