TEMPERATURE CONTROL METHOD AND TEMPERATURE CONTROL DEVICE

Provided is a temperature control method capable of causing the heating temperature by a heater to quickly converge to a target temperature in accordance with an environmental ambient temperature. An embodiment of a temperature control method comprises: a step (A) of obtaining, by means of PID control, a first energization rate y1 based on a first temperature difference e1 between an actually measured temperature Ta and a target temperature Ts; a step (B) of obtaining a second energization rate y2 based on a second temperature difference e2 between the ambient temperature Te of the environment in which a heating barrel 2 is disposed and the target temperature Ts; a step (C) of obtaining a corrected energization rate y on the basis of the result of comparison of the first energization rate y1 and the second energization rate y2; and step (D) of controlling the electrical power to be supplied to a heater 4 on the basis of the corrected energization rate y. In step (C), the corrected energization rate y is set to any of predetermined first, second, and third conditions on the basis of the comparison result.