Biological information measurement device

A biological information measurement device which measures a blood pressure and an electrocardiographic waveform of a subject, the biological information measurement device comprising:

• a fluid bag which is wound around a measurement target site of the subject in a circumferential direction;
• a pump which supplies a fluid into the fluid bag;
• a valve which communicates with the fluid bag and is provided in a flow path of the fluid;
• a blood pressure measurement unit which compresses the measurement target site by supplying the fluid from the pump to inflate the fluid bag or releases compression on the measurement target site by controlling the valve to discharge the fluid in the fluid bag to contract the fluid bag, and measures a blood pressure of the measurement target site;
• a first electrode which comes into contact with a first site of the subject;
• a second electrode which comes into contact with a second site of the subject different from the first site, is connected to the fluid bag extending in the circumferential direction, is supported by a support member further extending in the circumferential direction from an end portion of the fluid bag in the circumferential direction, and is arranged at a position separated from the end portion by a predetermined distance in the circumferential direction;
• an electrocardiogram measurement unit which measures an electrocardiographic waveform of the subject through the first electrode and the second electrode;
• a belt portion which is wound around an outer circumferential side of the fluid bag and fixes the biological information measurement device to the measurement target site;
• and
• contact state stabilizer which suppresses a change in a contact state of the second electrode with the second site accompanying a volume change of the fluid bag.