[Problem] To provide a temperature measurement device for a rotating member of a processing device that grips a rotating member made from a metal and capable of rotating around a rotational axis, and moves in coordination with and coaxially rotates with the rotating member. [Solution] This temperature measurement device is equipped with: an ideal temperature setting means for setting an ideal temperature while the rotating member is rotating; a temperature measurement means for measuring an actual temperature while the rotating member is rotating; and a detection means for detecting whether or not the difference between the actual temperature measured by the temperature measurement means and the ideal temperature set by the ideal temperature setting means exceeds a pre-set threshold at the time the actual temperature is measured.
