An injection needle includes a needle tube having a discharging port at a needle point for discharging a treatment liquid, the needle tube including a stabbing tube having a blade surface with the discharging port formed thereon, and a main needle tube which is thicker than the stabbing tube, with the stabbing tube provided on a tip portion of the main needle tube, wherein the stabbing tube satisfies a dimension condition such that an outer diameter is 70 μm or less (not including zero), and an inner diameter is 40 μm or less (not including zero), and a tilt angle θ of the blade surface with respect to a central axis of the stabbing tube satisfies a condition of 30°<；θ≦45°.
