To provide an injection machine having a simple structure and a light operation load.

This chemical fluid injection machine is equipped with a pump 15 connected through a suction tube 13 to a chemical fluid tank 12, a power source 18 for operating the pump 15, a chemical fluid supply pipe 20 that is connected through a discharge tube 17 to the pump 15 and has its top side as a grip part 19, a nozzle 21 that is arranged at the lower end of the chemical fluid supply pipe 20 and has a discharge opening 24, a sensor (limit switch) 22 that is arranged in the vicinity of the nozzle 21 and is made on when depressed, and a control circuit 32 that operates the pump 15 by the sensor 22 made in a detection state and discharges a chemical fluid from the discharge opening 24.