The present invention provides a chemical liquid injection system in which a chemical liquid injector can detect whether or not the injection of a liquid from a liquid syringe into a patient is inappropriate for a personal reason such as the development of a side effect although the liquid is of an appropriate type for the injection system, and the chemical liquid injector can issue an alarm to notify the inappropriate injection. Chemical liquid injector 100 acquires a product ID of the liquid recorded on liquid chip 214 of liquid syringe 200 and an inappropriate ID recorded in a electric chart to output a notification when the product ID matches the inappropriate ID.
