The utility model relates to a positioning device for a medical needle, which is suitable for sheathing a needle for piercing a skin, and comprises a base tube suitable for sheathing the needle, and two wings extending outwards from two opposite sides of the base tube.The base pipe comprises a bottom wall and a surrounding wall connecting two opposite sides of the bottom wall.Each wing piece includes a bending part connecting the base pipe and a limiting part connecting the bending part. Each limiting part has a abutting area extending outwards from the bending part, and each abutting area has a covering opposite to the skin and matching the shape with the surrounding wall.The fins may swing between an unfolded position and a superimposed position relative to the base tube. At the superimposed position, the covering surfaces are fitted against the opposite sides of the surrounding wall so that the needle cannot shake with the base tube relative to the fins.一種醫療用針的定位裝置，適用於套設在一用以刺入一皮膚的針頭，並包含一適用於套設在該針頭的基管，及二分別自該基管兩相反側向外延伸的翼片。該基管包括一底壁，及一銜接該底壁兩相反側的圍繞壁。每一翼片包括一銜接該基管的彎折部，及一銜接該彎折部的限位部，每一限位部具有一自該彎折部向外延伸的靠抵區，每一靠抵區具有一相反於該皮膚且形狀與該圍繞壁相配合的包覆面。該等翼片可相對於該基管在一展開位置及一疊合位置間擺動，在該疊合位置時，該等包覆面相配合貼抵在該圍繞壁的相反兩側，使該針頭無法隨該基管相對於該等翼片晃動。
