Injection molding machine

An injection molding machine comprising:

• a fixed mold;
• a movable mold which is capable of contacting to and separating from the fixed mold;
• and
• an injection unit which supplies molten resin to a space formed between the fixed mold and the movable mold when being pressed to a non-molding face of the fixed mold, wherein the injection unit comprising:
• a nozzle portion which injects molten resin to the space formed between the fixed mold and the movable mold;
• an injecting portion which applies molten resin pressure toward the space formed between the fixed mold and the movable mold through the nozzle portion, wherein only resin collected in the nozzle portion can possibly exceed a one-shot volume;
• a first heater and a first temperature sensor which are provided at a tip side at the nozzle portion;
• a second heater and a second temperature sensor which are provided at a side near to the injecting portion at the nozzle portion;
• and
• a third heater and a third temperature sensor which are provided at the injecting portion, and wherein a target temperature of the first heater is lower than a target temperature of the second heater, and the target temperature of the second heater is higher than a target temperature of the third heater;
• wherein detection accuracy of the first temperature sensor and the second temperature sensor are higher than detection accuracy of the third temperature sensor, such that the temperature of the one-shot volume of the resin is being adjusted within temperature monitoring accuracy of + or −0.2 degree Celsius or smaller.