The present invention so that there is no occurrence of a metal piece which may cause problems flowing into the human body, and to provide an indwelling needle that manufactured the inner needle and the caulking pin of synthetic resin. A liquid transfusion, blood collection, is used to perform dialysis or the like, a base 22 having an internal space 21, and Uchisen 25 for closing one end of the inner space is arranged in the base, from the tip of the base portion extends, the outer needle 24 made of a synthetic resin having a through hole 27 which communicates with the interior space, an inner stopper, and an inner needle 31 extending from the outer needle through the inner space and the through hole and is disposed on the base, In the indwelling needle 1 characterized by at least a caulking pin 26 to hold the inner needle movably to the base, the inner needle 31 and the caulking pin 26, is formed of synthetic resin. .BACKGROUND【課題】人体内に流れ込み問題を生じるおそれのある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にて製造した留置針を提供する。【解決手段】液、輸血、採血、人工透析等を行うために使用され、内部空間21を有する基部22と、基部に配されて内部空間の一端を閉鎖する内栓25と、基部の先端から延出し、内部空間と連通する貫通孔27を有する合成樹脂からなる外針24と、内栓、内部空間及び貫通孔を貫通して外針から延出する内針31と、基部に配され、内針を基部に移動自在に保持するカシメピン26とを少なくとも具備する留置針1において、内針31及びカシメピン26を、合成樹脂によって形成した。【選択図】図1
