The needle shaped outer cylinder 1 comprises a needle tube 3, a joint tube 4 having a needle tube accommodating hole 42 for receiving a proximal end portion of the needle tube and a joint outer peripheral portion 47 having a diameter reduced in diameter, and an outer tubular member 2 having a tip joint portion 22 having a bore 26 capable of receiving the joining member 4 from the tip end side.The outer cylindrical member is provided with a projection 28 provided at the base end portion of the lumen 26, and the joint member has an abutting portion 48 in contact with the projection of the outer cylindrical member.The joining member 4 is inserted into the lumen of the outer tubular member, and the projection 28 of the outer cylindrical member abuts against the contact portion of the joint member 4.The joining member 4 is fixedly bonded to the outer cylindrical member and the needle tube by a thermal welding portion 45 formed at a position on the side of the predetermined length base end from the tip end of the tip joint.針付き外筒１は、針管３、針管の基端側部分を収納する針管収納孔４２と外径が縮径する接合外周部４７とを有する接合部材４、先端側より接合部材４を受入可能な内腔２６を有する先端接合部２２を備える外筒部材２とからなる。外筒部材は、内腔２６の基端部に設けられた突出部２８を備え、接合部材は外筒部材の突出部と当接する当接部４８を備える。接合部材４は、外筒部材の内腔に挿入され、外筒部材の突出部２８と接合部材４の当接部は当接している。接合部材４は、先端接合部の先端より所定長基端側となる位置に形成された熱溶着部４５により、外筒部材および針管に固着接合されている。
