PROBLEM TO BE SOLVED: To provide a medical puncture device capable of quickly projecting a needle tube out of a first hollow member and a method for manufacturing the same. SOLUTION: A first hollow member 10 and a second hollow member 20 arranged in a cavity 11 of the first hollow member 10 and a second hollow member 20 are fixed in the lumen 21 and are fixed in the cavity 21. A medical puncture device 1 having a needle tube 30 communicating with each other, which is a plane perpendicular to the perspective direction of the first hollow member 10 and a section from the distal end of the first hollow member 10 to the proximal side of 15 cm. (1) and (2) are satisfied by the surface 41 at which the cross-sectional area of the first hollow member 10 is maximized at 40. (1) The center point Cin of the inscribed circle 15 of the first hollow member 10 is eccentric from the center point Cout of the circumscribed circle 16. (2) The center point Cin is the starting point, and the tip 30a of the needle tube 30 is lowered to the surface 41. The direction of the vector A whose end point is the point P where the perpendicular line L and the surface 41 intersect is the same as the direction of the vector B whose start point is the center point Cin and the end point is the center point Cout.【課題】針管を第１中空部材の外に素早く突出させることができる医療用穿刺装置とその製造方法を提供する。【解決手段】第１中空部材１０と、第１中空部材１０の内腔１１に配置されている第２中空部材２０と、第２中空部材２０の内腔２１内に固定され、内腔２１に連通している針管３０と、を有する医療用穿刺装置１であり、第１中空部材１０の遠近方向に垂直な面であって第１中空部材１０の遠位端から１５ｃｍ近位側までの区間４０で第１中空部材１０の断面積が最大となる面４１で（１）および（２）を満たす。（１）第１中空部材１０の内接円１５の中心点Ｃinは外接円１６の中心点Ｃoutから偏心した位置（２）中心点Ｃinを始点、針管３０の先端３０ａから面４１に下ろされた垂線Ｌと面４１とが交わる点Ｐを終点とするベクトルＡの方向と、中心点Ｃinを始点、中心点Ｃoutを終点とするベクトルＢの方向が同じ【選択図】図２
