To provide a puncture needle which can be inserted straight.SOLUTION: A puncture needle 0 is provided with a hollow portion 0a extending in a uniaxial direction and provided with a first surface 1 having an acute angle with respect to the uniaxial direction and a second surface 1 having an acute angle with respect to the uniaxial direction in a direction opposite to the first surface 1 An acute second surface 2 is provided. The component force perpendicular to the insertion direction of the reaction force received by the first surface 1 when the tip 0b is inserted into the human body through the skin and the component force perpendicular to the reaction force insertion direction applied to the second surface 2 are substantially canceled out , The puncture needle 0 is less likely to be bent at the time of insertion, and it can be pierced straight.BACKGROUND OF THE INVENTION【課題】まっすぐ刺し入れることができる穿刺針を提供する。【解決手段】穿刺針0は、一軸方向に延びる中空部0aが設けられた筒体0において、一軸方向に対して鋭角な第1面1、一軸方向に対して第1面1と逆向きに鋭角な第2面2が設けられている。皮膚を介して先端0bを人体に刺し入れた際に第1面1が受ける反力の挿入方向に垂直な分力と第2面2が受ける反力挿入方向に垂直な分力とが略相殺するため、穿刺針0が挿入時に湾曲することが少なく、まっすぐ刺し入れることができる。【選択図】図1
