To provide an injection needle for eliminating the maximum value of resistance force at the time of piercing at the junction of a slope, improving sharpness and reducing pains.

A sharp end part to a blade tip 5 is constituted of the first slope 2 of 10-15°, the second slope 3 of 15-20° and the third slope 4 of 21-25°. The rate of length is set to 40%-50%, 5%-15% and 35%-55%. At the time of forming the second slope 3 and the third slope 4, a cylindrical body 1 and a grindstone are turned to twisted positions and they are inclined downwards on the outer side of the radial direction of the body 1.