The present invention provides an automatic analysis device whereby an interval between the distal end of a sample nozzle and the bottom of a reaction container can be controlled irrespective of individual differences between reaction containers or sample nozzles, and adhesion of a sample to a sample nozzle can be suppressed. Sample nozzles 13a, 14a are moved toward the bottom surface of a reaction container 2, movement thereof is stopped at the time when a stop position sensor 46 senses a stop position sensing plate 45, a sample is raised from the stop position to a position at which the stopposition sensing plate 45 is separated from the sensing range of the stop position sensor 46, and an arm 44 is furthermore moved upward a movement distance stored in memory. The sample nozzles 13a, 14a can be stopped and the sample can be discharged in a state in which the distal ends of the sample nozzles 13a, 14a are in contact with the bottom surface of the reaction container 2 and bending ofthe sample nozzles 13a, 14a is suppressed.