Body fat measurement device

A body fat measurement device comprising:

• a bioelectrical impedance measurement body attachment unit including a plurality of electrodes arranged in contact with a body of a subject in an attached state;
• an impedance measuring portion for measuring a bioelectrical impedance of the subject using the plurality of electrodes;
• and
• a body fat mass calculating portion for calculating a body fat mass of the subject based on the bioelectrical impedance measured by the impedance measuring portion;
• wherein
• the bioelectrical impedance measurement body attachment unit includes an electrode support for supporting the plurality of electrodes and a long belt to be wrapped around the body of the subject in the attached state to attach the electrode support to the body of the subject;
• the belt includes, in least at one part, a stretchable region that stretches in a length direction;
• the electrode support includes a fixing portion fixed with one end of the belt in a relatively immovable manner with respect to the electrode support and a holder for holding a portion closer to the other end of the belt in a relatively movable manner with respect to the electrode support in the attached state;
• the holder includes a wrapping length adjustment mechanism for adjusting a wrapping length of the belt;
• and
• the body fat measurement device further includes,
• a displacement amount detection unit for detecting a displacement amount in the length direction of the belt caused by the stretching of the stretchable region, and
• a wrapping length adjustment mechanism control section for automatically adjusting the wrapping length of the belt by controlling the wrapping length adjustment mechanism based on information detected by the displacement amount detection unit
• wherein the wrapping length adjustment control section extends the belt when the detected displacement amount of the stretchable region determined by the displacement amount detection unit surpasses a predetermined value and the wrapping length adjustment control section retracts the belt when the detected displacement amount of the stretchable region determined by the displacement amount detection unit goes below the predetermined value.