A corpuscle/plasma separating part is disposed at the lower end of the substrate, and a sensor part connected to the corpuscle/plasma separating part is disposed at the upper end of the substrate, with a calibration solution reservoir being disposed on the lower side of the sensor part, and a calibration solution waste reservoir being disposed on the upper side of the sensor part. A first centrifugal axis is located upper to the corpuscle fraction storing part and lower to the plasma fraction storing part of the corpuscle/plasma separating part, while a second centrifugal axis is located within or close to the sensor part. Conveyance and discharge of the calibration solution can be carried out by performing centrifugation around the first centrifugal axis which is distant from the sensor part at a low speed of rotation, so that the centrifugal force exerted on the sensors would be small. During the centrifuge operation at a high speed of rotation for the separation of blood corpuscles, centrifugation can be performed around the second centrifugal axis so that the centrifugal force exerted on the sensors is small. Centrifuge operation allows separation of the blood corpuscles and blood plasma, and conveyance of the blood plasma and the calibration solution, as well as certain discharge of the calibration solution from the sensors, thereby allowing precise analysis. Any damage in the sensors due to strong centrifugal force during the separation of blood corpuscles and blood plasma can be prevented.