To provide an improved injector for supplying a fluidized and/or high-viscosity material and being sure to actuate even at the application of high pressure, by improving an injector of the type having an injection pipe with a discharge nozzle, a material container positioned within the injection pipe, a grip member positioned at the end of the injection pipe opposite to the discharge nozzle, and an injection piston making ingression movement into the injection pipe through the grip member.

The grip member 8 is positioned in the injection pipe 1 by use of a thread 12 and the material container 5 has a closed outer peripheral surface.