An analytical device according to the present invention comprises a liquid accommodating chamber 9 for accommodating a sample solution of a quantity required for analyzing; a volume measuring chamber 10 connected to the liquid accommodating chamber 9 with a connecting path 13 and disposed in the exterior of the liquid accommodating chamber 9 in a radial direction; an overflowing chamber 11 connected to the volume measuring chamber 10 for accommodating an excessive quantity of the sample solution; and a measuring cell 12 for transferring and measuring the sample solution measured in the volume measuring chamber 10; wherein an overflowing port 14 of the volume measuring chamber 10 is connected to a flow-in port 16 of the overflowing chamber 11 by a capillary path 17.