The present invention relates to a syringe and, particularly, to a device for more smoothly suctioning a medicinal fluid by sharing a part of an injection channel excluding a syringe needle, or by forming a suction channel completely independent from the injection channel in a conventional syringe having the injection channel including the syringe needle, the syringe comprising a syringe needle (10) and cylinder (20) so as to have an injection channel extending from the cylinder (20) to the syringe needle (10), and further comprising: an opening and closing means (400) for selectively sealing the injection channel； a suction channel including a through-hole (200) for allowing for communication between the inside and the outside of any one of the syringe needle (10), a connector for connecting the syringe needle (10) to the cylinder (20), and the cylinder (20), such that the suction channel extends up to the cylinder (20) from a hollow cap (100) having a tip； and a valve means (300) for controlling the opening and the closing of the suction channel by a user operation. Therefore, since a separate suction channel not passing through a syringe needle is formed in a conventional syringe so as to allow a medicinal fluid to suction more smoothly, user convenience and marketability of a product can be maximized, and the suction channel can be forcibly closed during injection.La presente invención se refiere a una jeringa, y más particularmente, a un aparato obtenido mejorando una jeringa convencional formada con un conducto de flujo de inyección que incluye una aguja de inyección, con el fin de compartir una parte de conducto de flujo de inyección excepto la aguja de inyección o para formar un conducto de flujo de succión completamente independiente del conducto de flujo de inyección, de ese modo además facilita la succión de un medicamento líquido. La jeringa incluye una aguja de inyección (10), un cilindro (20) y es formado con un conducto de flujo de inyección que se ex
