The present invention relates to a filter cap for a syringe, and the filter cap has: a pressure-reducing groove portion formed at the rear of an injection inflow path and of which the diameter is expanded and a filter embedded at the rear of the pressure-reducing groove portion, such that the suction pressure of an injection solution passing through the filter is reduced during the suctioning of the injection solution through a syringe, and thus the injection solution can be suctioned with little force during the suctioning of the injection solution through the syringe. The present invention comprises: a housing having a syringe needle insertion path formed therein, having a syringe needle hub insertion path formed at the rear of the syringe needle insertion path, and having a shaft tube part formed on the outer periphery of the front thereof a fixing member having an injection solution inflow path formed on the front therein, having, at the rear of the injection solution inflow path, an insertion groove inserted and fixed to the shaft tube part, and having a suction pressure-reducing part, which reduces the suction pressure of the injection solution and is formed between the injection solution inflow path and the insertion groove a filter attached to a front end portion of the insertion groove through ultrasonic bonding, and having a rear circumference coming into close contact with a front end portion of the shaft tube part and a suction needle part provided at the front of the fixing member, and having, therein, an injection solution suction path communicating with the injection solution inflow path.La présente invention concerne un bouchon de filtre pour une seringue, et le bouchon de filtre présente : une partie de rainure de réduction de pression formée à larrière dun trajet dentrée dinjection et dont le diamètre est étendu et un filtre incorporé à larrière de la partie de rainure de réduction de pression, de telle sorte que la pression daspiration dune solut
