With the needle-attached outer cylinder manufacturing method of the present invention, in a state in which the joining member 4 having the needle tube 3 inserted into the needle insertion hole 42 is inserted into the distal end connecting portion 22 of the outer tubular member 2, the material of the outer tubular member 2 A preheating step of heating the temperature of the front end side tubular portion 43 of the joining member 2 to a temperature equal to or lower than the softening point and a step of pressing the distal end side tube portion 43 of the joining member 2 toward the rear end direction of the joining member 4 with a pressing force of 4 N to 30 N , And a joining member welding step of thermally welding the joining member 4 to the distal end connecting portion 22 of the outer tubular member 2.本発明の針付き外筒の製造方法は、針管３が針挿入孔４２に挿入された接合部材４を外筒部材２の先端接続部２２に挿入した状態で、外筒部材２の形成材料の軟化点以下の温度に加熱する予備加熱工程と、予備加熱工程後に、押圧部材１７により接合部材２の先端側筒部４３を接合部材４の後端方向に４Ｎ～３０Ｎの加圧力で押圧しながら、接合部材４を外筒部材２の先端接続部２２に熱溶着させる接合部材溶着工程とを行うものである。
