The present invention relates to a filter syringe. In particular, a syringe having a filter means for filtering foreign materials such as glass pieces of an ampoule is modified to prevent foreign materials from being injected with a medicinal liquid. Specifically, the filter syringe can smoothly suction and inject a medicinal liquid through a little power even when a filter means having a fine pore size is applied. The filter syringe comprises a syringe needle (10), a cylinder (20), and a plunger (30). The filter syringe comprises: a suctioning flow path formed to extend from a hollow cap (100) having a cutting edge to the cylinder (20), and including a unidirectional valve means and an injecting flow path formed to extend from the cylinder (20) to the syringe needle (10), and including a detachable opening and closing means (400) for selectively opening and closing the syringe needle and a filter mans (200) for filtering foreign materials from a medicinal liquid. The injecting flow path and the suctioning flow path shape parts thereof, or the injecting flow path is independently formed from the suctioning flow path. Accordingly, a flow path extending from the filter means (200) to the syringe needle (10) of the injecting flow path is independently formed from the suctioning flow path, and a filter means is prepared in the injecting flow path to prevent foreign materials from being injected with a medicinal liquid. Even when a filter means having a fine pore size is applied, a medicinal liquid can be more actively suctioned and injected. Thus, user convenience and syringe merchantability can be maximized.COPYRIGHT KIPO 2017본 발명은 필터 주사기에 관한 것으로서, 특히, 앰플의 유리조각 등 이물질을 여과시키는 필터수단이 마련된 주사기를 개선하여, 이물질이 약액과 함께 주사되는 것을 방지하는 한편, 특히 미세한 기공크기의 필터수단이 적용되더라도 약액을 적은 힘으로 부드럽게 흡입 및 주사할 수 있도록 하기 위한 장치에 관한 것으로서, 주사바늘(10), 실린더(20), 그리고 플런저(30)를 포함하는 주지의 주사기에 있어서, 첨단을 갖는 중공의 캡(100)으로부터 상기 실린더(20)에 이르도록 형성되며, 주지의 일방향 밸브수단(300)을 포함하는 흡입유로와 상기 실린더(20)로부터 상기 주사바늘(10)에 이르도록 형성되며, 상기 주사바늘(10
