To allow a user to live a relaxed life by enabling a relaxed state measuring device to be used easily in a short time, and thus allowing the user to lightly use it.

A measuring electrode terminal 3 looks like a mouse. Skin resistance is measured from the impedance between a plurality of measuring electrodes 50a, 50b brought into contact with the fingers of a subject whose relaxed state is to be measured. By detecting the start of finger touch, the start of measurement is detected. After the start of the measurement has been detected, the initial value of skin resistance is obtained. Changes in relaxed state of the subject are measured from changes in skin resistance with respect to the initial value.