The present invention suppresses the formation of a pocket in a wall of a puncture route when 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 Nmm 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.
