A filter structure for a syringe comprises a filter unit installed within a cylinder and connected to a needle coupled to the front of the cylinder-in order to perform filtering when an injection solution introduced into the cylinder through the rear thereof is discharged through the needle, wherein a second fluid passage is formed outside a first fluid passage, and the filter unit comprises: a first check valve that is connected with the needle and blocks the second fluid passage； a second check valve that blocks the first fluid passage； a filter member installed on the second fluid passage； and a filter body located between the first check valve and the filter member and coupled to the first check valve at the front thereof and to the second check valve at the rear thereof.
