A quantitative syringe-type ejector capable of ejecting the contents packed in one syringe in small quantities is provided. The quantitative syringe-type ejector includes a syringe and a plunger. The plunger includes a piston holding member and a plunger operation member. The piston holding member has at least one arm having: a slide projection slidable on an inner peripheral surface of the syringe and a lock projection to be releasably locked to a back end of the syringe. The plunger operation member has a lock part to be releasably locked to the back end of the syringe.
