A body fat measurement device includes a plurality of electrodes including back area electrodes and upper limb electrodes, a body impedance measurement unit that measures a body impedance using the plurality of electrodes, a body composition information calculation unit that calculates a body fat mass based on the body impedance, a fitting belt for bringing the back area electrodes into contact with the surface of the measurement subject's back area in a pressurized state, and an upper limb unit that includes a gripping portion that can be gripped by the measurement subject's hand, the upper limb electrodes being provided in the gripping portion. The upper limb unit can be attached to and detached from the fitting belt.