A medical puncture needle (1) according to the present invention includes a distal end portion (2) including a needle tip (8) and a main body portion (3) that is continuous with the distal end portion (2) and has a substantially circular cross-sectional outer shape. ), And when setting one imaginary plane (X) including the central axis (O) of the main body (3), the tip (2) has the needle tip (2) in the central axis direction. 8) Provided with a blade surface (5, 6) formed of a curved surface, the angle (θ) with respect to the virtual plane (X) in a cross section orthogonal to the central axis direction gradually decreases toward the side.本発明に係る医療用の穿刺針（１）は、針先（８）を含む先端部（２）と、当該先端部（２）と連続し、略円形状の断面外形を有する本体部（３）と、を備え、前記本体部（３）の中心軸線（Ｏ）を含む１つの仮想平面（Ｘ）を設定した場合に、前記先端部（２）は、前記中心軸線方向において前記針先（８）側に向かうにつれて、前記中心軸線方向に直交する断面における前記仮想平面（Ｘ）に対する角度（θ）が漸減する、曲面で構成された刃面（５、６）を備える。
