PURPOSE: An apparatus for testing dissolution of drugs is provided to accurately maintain stirring position of a stirring device by introducing a stopper which is arranged at lower part of guide part of a base. CONSTITUTION: An apparatus for testing dissolution of drugs comprises a base (10A,10b), support block, stirring device (30), clamping device (40), balacing device, and stopper. The base comprises plural test tubes (13) and guide part (15). The support block comprises a mounting part and container (25a). The stirring device is connected to the container of support block and placed at upper part of each test tubes.
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