PROBLEM TO BE SOLVED: To provide a novel metered syringe-type ejector that can prevent reuse after usage.SOLUTION: The metered syringe-type ejector 1 includes: a syringe 2； and a plunger 3 inserted into the syringe 2 from its rear end side and pressing a piston P by pressing force of an operation part 52 provided at the rear end part thereof to inject a content fluid M, where the operation part 52 is stored inside the syringe 2 so as not to be pulled back when the plunger 3 is fully pushed in.
