A problem to be solved is to use a measured pain degree for comparison with a pain degree of another subject or for diagnosis of a disease. A pain measuring device 1 has an electrode 3a to be attached to a subject 2 and a stimulation current generation means generating a stimulation current to be supplied to the electrode 3a. Then, the pain measuring device 1 measures pain felt by the subject 2 based on the stimulation current applied from the electrode 3a to the subject 2. The pain measuring device 1 has a means to display a relation between a pain measurement value being a logarithmic value or a logarithmic-type value of a value founded on the stimulation current and a value of a VAS or a face scale which the subject 2 selects.
