PROBLEM TO BE SOLVED: To provide a biological information measuring device capable of reducing a time and labor to put electrodes on a subject and discomfort felt by the subject due to the contact of the electrode on the skin.SOLUTION: A biological information measuring device 10 comprises: electrodes 21, 22, 31, and 32 which are at least partially housed inside the belts of first and second cuffs 20 and 30 to avoid appearance on the surfaces of the cuffs a resonance circuit which comprises a capacitor when the electrodes 21, 22, 31, and 32 are regarded as the capacitor with dielectric substances of the body 40 of the subject inserted electrically between the electrodes 21, 22, 31, and 32 of the first and second cuffs 20 and 30 and the other substances a high frequency current source 60 which supplies high frequency current to the electrodes 21, 22, 31, and 32 of the first cuff 20 and the second cuff 30 and a detector 70 which detects impedance fluctuation on the basis of the voltages of the electrodes 21, 22, 31, and 32 of the first cuff 20 and the second cuff 30 and detects biological information on the basis of the impedance fluctuation.
