PURPOSE: A down injector is provided to improve an internal operation environment in a work place with accuracy and rapidity of operation while efficiently and conveniently sucking and filling the down through automation equipment. CONSTITUTION: A down injector comprises the following: a fixture(180) fixing one side of a suction vacuum pipe(170) and a cylinder protecting pipe(162); a cylinder protection pipe fixing a cylinder(160); a bypass connector(140) connected with one side of a cylinder fixing unit; a suction pipe fixing holder(120) fixed on one side of the bypass connector; and a perforated pipe(130) equipped inside the bypass connector and the suction pipe fixing holder.
