To improve maneuvability of a cartridge by a method wherein a fixing member which can be moved independently from a piston is loaded by a spring force, and after the cartridge in which a material is filled is inserted in an ejector device, the cartridge can be surely held at a specified location without an additional manual operation.

An ejector device has a piston 2 which is slidably arranged in a guide sleeve 1, and the piston 2 is returnable by using a gripping member 4 which is provided at the rear end part, and also, is slide-operated by grasp- operating a lever 5. Then, at the front end part of the guide sleeve 1, a front side part 8 including a cartridge 15 is attached by a connecting member 7, and a material in the cartridge 15, is extruded from the discharging tip end part by a plug body in the cartridge 15. At the front end part of the front side part 8, a fixing member 13 equipped with a taper 10, is provided, and by urging the fixing member 13 forward by a spring 14, the cartridge 15 is held and fixed.