This antiadhesive material includes as an active ingredient thereof: poly ? glutamic acid having a weight average molecular weight in the range of 600000 13000000 or a kinematic viscosity at 37°C in the range of 2cSt to 15cSt when dissolved in distilled water at a concentration of 0.05 mass%； and/or a salt thereof. This antiadhesive material is capable of being provided having an arbitrary form as a powder or a gel for instance and thus is easy to handle even with respect to relatively localized surgery such as endoscopic surgery and can more reliably inhibit adhesion.
