An object of the present invention is to provide a system for performing objective examination of central sensitization, in particular, a system for objectively determining the presence or absence of central sensitization in a chronic pain patient. The present invention provides a device for diagnosing the presence or absence of central sensitization, the device including: stimulation output means for outputting thermal stimulation which can be perceived by a subject； first input means capable of inputting a measurement start signal； second input means capable of inputting a measurement end signal； and measurement control means for measuring time between an input signal from the first input means and an input signal from the second input means. The measurement control means determines that the central sensitization is present when the time between the input signal from the first input means and the input signal from the second input means is longer than t seconds (where t represents 30 seconds or more and less than 90 seconds).
