An epidural space identification device to identify when a tip of a needle used for epidural anesthesia enters an epidural space that includes a barrel formed in a cylindrical shape and communicatively connected to a needle section, a plunger formed in a cylindrical shape, retractably inserted into the barrel, and having an air hole communicating with an inside of the plunger, and an expansible member having an expansible part provided at a front end part of the plunger and bulging inside of the plunger with a positive pressure generated by pushing the plunger while air discharge from a needle side is regulated.
