The present invention is aimed at suppressing the formation of a pocket in a wall of a puncture route when a needle, being a dull needle, is moved forward along the puncture route. In order to achieve such aim, the invention provides a needle to be inserted into a puncture route extending from skin to a blood vessel under the skin to puncture the blood vessel, wherein: the needle is formed in a tubular shape and has an inclined end face at a tip of the needle, the inclined end face being inclined relative to an axis of the needle, a tip end of the inclined end face defining an unsharp edge the needle has a flexibility of needle elastic modulus nE = 1-900 N as defined by an equation to be set forth below a material of the needle is a resin and the needle is manufactured by injection molding using a ring-shaped gate, wherein the needle elastic modulus nE=M2−M1/ε2−ε1, where:M1 is a bending moment under a bending strain of 0.0005 in a three-point bending testM2 is a bending moment under a bending strain of 0.0025 in the three-point bending testε1 is a bending strain of 0.0005 andε2 is a bending strain of 0.0025.
