A liquid injection needle (10) includes a hollow needle part (2) for injecting a liquid (8) and a supporting part (3), to which the needle part (2) is fixed. The needle part (2) includes an anchoring part (22) that extends through the inside of the supporting part (3) and a puncturing part (21) that extends from the supporting part (3) for making a puncture in a living body. The puncturing part (21) has a distal side outer diameter equal to or greater than 0.1 mm and equal to or less than 0.25 mm, and a proximal side outer diameter than the distal side outer diameter.