Abdomen wearing unit for measuring impedance of living body and body fat measuring device

An abdomen wearing unit (100a) for measuring the impedance of a living body comprises a portion (110) for supporting an electrode (113), and a long belt portion (140) wound around the abdomen of a subject. The electrode supporting portion (110) includes a relatively fixed portion (114) where one end (141) of the belt portion (140) is fixed immovably for the electrode supporting portion (110), anda portion (115) for holding a part of the belt portion (140) close to the other end (142) relatively movably for the electrode supporting portion (110). The holding portion (115) has a portion (130) which can be fixed removably to an arbitrary position of a part of the belt portion (140) close to the other end (142), and a portion for coupling the fixing portion (130) and the electrode supportingportion (110) and urging them in the approaching direction. With such an arrangement, an abdomen wearing unit for measuring the impedance of a living body in which an electrode can be applied with a constant load to the abdome