Abstract: A bioelectrical impedance measurement abdomen attachment unit (100A) includes an abdomen rear surface side base portion (110A), an abdomen front surface side base portion (120A), and a pair of abdomen front surface side belt members (143a, 143b). The abdomen front surface side base portion (120A) includes a sheet (122) arranged with a pair of wind-up units (130a, 130b), and an electrode film (126) arranged with an impedance measurement electrode (128). Each wind-up unit (130a, 130b) includes a wind-up mechanism for accommodating the abdomen front surface side belt members (143a, 143b) in a winding manner, where the abdomen front surface side belt member (143a, 143b) is pulled out and connected to the abdomen rear surface side base portion (110A) by way of a connection tool in the attached state.

Abstract: A bioelectrical impedance measurement abdomen attachment unit includes an electrode support for supporting an electrode and a long belt to be wrapped around an abdomen of a subject. 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 another end of the belt in a relatively movable manner with respect to the electrode support. The holder includes an attachment portion removably attachable to an arbitrary position of the portion closer to the other end of the belt and a biasing portion for coupling the attachment portion and the electrode support and biasing the attachment portion and the electrode support in an approaching direction.