A device for analysis of a solution, the device comprising: an operation cavity for stirring and mixing of solutions such as a sample solution and a diluent, reacting a solution and a reagent retained in the operation cavity, and being optically accessed to a reaction liquid having been reacted to the sample liquid; a receiving cavity for receiving the solution from the operation cavity through a connection section, the receiving cavity being located between a rotation axis and the operation cavity, the operation cavity and the receiving cavity being arranged from an upstream side of the device to a downstream side of the device in relation to the direction of gravity upon transferring the solution from the operation cavity to the receiving cavity; an air hole provided in the operation cavity; anda rib for preventing the solution from flowing through the air hole when the solution is stirred and mixed by swinging the device around the rotation axis and is disposed at the operation cavity; characterized in that the device has a micro channel structure for transferring the solution to a measurement spot by a centrifugal force generated by rotating the device around the rotation axis and being used for reading in which the reaction liquid has been reacted to the solution at the measurement spot is optically accessed, and the connection section for transferring the solution in the operation cavity to the receiving cavity by inclining the rotation axis by an angle of inclination of θ° relative to a horizontal line, the connection section being located inside closer to the rotation axis than a liquid level of the solution which has been transferred and retained in the operation cavity by the centrifugal force generated by rotating the device around the rotation axis and located inside closer to the rotation axis than the rib. an operation cavity for stirring and mixing of solutions such as a sample solution and a diluent, reacting a solution and a reagent retained in the operation cavity, and being optically accessed to a reaction liquid having been reacted to the sample liquid; a receiving cavity for receiving the solution from the operation cavity through a connection section, the receiving cavity being located between a rotation axis and the operation cavity, the operation cavity and the receiving cavity being arranged from an upstream side of the device to a downstream side of the device in relation to the direction of gravity upon transferring the solution from the operation cavity to the receiving cavity; an air hole provided in the operation cavity; anda rib for preventing the solution from flowing through the air hole when the solution is stirred and mixed by swinging the device around the rotation axis and is disposed at the operation cavity; characterized in that the device has a micro channel structure for transferring the solution to a measurement spot by a centrifugal force generated by rotating the device around the rotation axis and being used for reading in which the reaction liquid has been reacted to the solution at the measurement spot is optically accessed, and the connection section for transferring the solution in the operation cavity to the receiving cavity by inclining the rotation axis by an angle of inclination of θ° relative to a horizontal line, the connection section being located inside closer to the rotation axis than a liquid level of the solution which has been transferred and retained in the operation cavity by the centrifugal force generated by rotating the device around the rotation axis and located inside closer to the rotation axis than the rib.