Abstract: To provide an automatic analyzer with no need to control a residual amount of a quality control sample. An automatic analyzer includes an input unit which receives a container including a specimen and a quality control sample, an ID reader which reads ID attached to the container, a control unit which assigns measurement items to the ID and controls each unit, and an analysis unit which dispenses the specimen and the quality control sample from the container and performs analysis based on the measurement items, in which when a liquid amount of a first container including the quality control sample is not enough, the control unit assigns measurement items not yet performed, of measurement items assigned to ID of the first container, to ID of a second container including the quality control sample and controls the analysis unit to perform analysis.