test tubes 1 in the rack 2 can be individually moved when one of the test tubes 1 comes to a predetermined position and is stopped there a suction nozzle 6 and a cleaning liquid injection nozzle 7 are inserted into that test tube 1 upon completion of the antigen antibody reaction in the test tube 1 the test solution is discarded to a discard bottle 8 through the suction nozzle 6 by the operation of an injector 9 cleaning liquid is injected into the test tube 1 through the cleaning liquid injection nozzle 7 so that the bead not shown in the test tube 1 is washed the cleaning liquid is then evacuated into the suction nozzle 6 and discarded to the discard bottle 8 the vertical movement of the suction nozzle 6 and the cleaning liquid injection nozzle 7 are performed by an elevator mechanism 10 after the test tube 1 is moved a reaction liquid is injected into the test tube 1 through a reaction liquid injection nozzle 12 by a reaction liquid injector 11 the test tube 1 is supported by a support mechanism 13 and vibrations are applied to the test tube 1 by a vibration member 14 so that the bead in the test tube 1 is brought into good 34 stirring 34 contact with.