The present invention relates to a medical injection needle and a manufacturing method therefor. The medical injection needle of the present invention is characterized in that the inside, made of a
metal material, is formed as a hollow
cylindrical tube; at one end of the tube, a
cutting part (10) consisting of an inclined portion (11) and a horizontal portion (12) is formed wherein the inclined portion is downwardly inclined at a certain angle from the upper end on the side and has a lower end positioned lower than the central axis (a) of the tube, and the horizontal portion is connected with the front end of the inclined portion (11) and is formed parallel to the central axis (a) of the tube; at one end of the tube, a flat round part (20) having a convexly rounded shape on the plane is formed; and the shape of the side cross-sectional area of the horizontal portion (12) consists of a protrusion part (14) and a side round part (16), wherein the protrusion part has one front end connected with the front end of the lower inner circumferential surface (13) of the tube, is formed vertically upward from the front end of the lower inner circumferential surface (13) of the tube, and has the other front end connected with the horizontal portion (12); and the side round part has one side connected to the front end of the horizontal portion (12) and has the other side connected with the lower surface (15) of the tube while forming a curve downwardly. According to the present invention, the end of the injection needle takes a rounded shape when seen on the plane and takes a rounded shape in the upward direction from the bottom when seen from the side, and so a pointed portion is not formed and thereby damage to muscles, nerves, and blood vessels does not occur when inserted under the
skin. Due to formation of the
cutting part consisting of the inclined portion inclined at a certain angle from one side of the upper section when seen from the side, and the horizontal portion in parallel to the direction of the central axis, thread can be smoothly inserted while naturally hung in the
cutting part during injection under the
skin while a part of the thread is inserted. Particularly, due to formation of the fine protrusion at the end of the injection needle, even though the thread is not a thread provided with a twisted part, the thread is naturally twisted, bent and inserted during
insertion of the injection needle under the
skin, thereby enabling an exact surgical procedure. In addition, the injection needle is manufactured through sanding finishing following a cutting process of the cutting part after the end of a hollow tube is welded while a rod is placed thereon, and thereby the thread is naturally hung while the inner circumferential surface of the injection needle becomes smooth.