The invention provides a body composition measuring device (100A) having electrodes (131, 133) for a right hand, made to be in contact with the right hand of a subject, and also has electrodes (132, 134) for a left hand, made to be in contact with the left hand of the subject so to measure the body impedance of the subject. The device body has a rod-like grip portion (111) provided with the electrodes (131, 133) for a right hand, a rod-like grip portion (112) provided with the electrodes (132, 134) for a left hand, and a base portion (103) to which the grip portion (111) for a right hand and the grip portion (112) for a left hand are fixed. The grip portion (111) for a right hand is rotatablely fixed to the base portion (103), and the extending direction of the grip portion (111) for a right hand is differentiated from the extending direction of the rotating shaft thereof. Consequently, a small and thin portable body composition measuring device can be achieved.