An automatic analyzer (100, 200) comprising: a sensor configured to measure a liquid amount of a container containing liquid; a flow path system; a liquid discharging unit configured to discharge liquid from the flow path system; a syringe (103, 208) that is connected to a branch portion of the flow path system and configured to change an internal pressure of the flow path; and a controller, wherein the flow path system includes a first flow path, a second flow path, a first electromagnetic valve, and a second electromagnetic valve, the first flow path ranging from a nozzle to the branch portion, the nozzle aspirating or dispensing liquid from or to the container, the second flow path ranging from the branch portion to the liquid discharging unit, the first electromagnetic valve being provided on the first flow path and opening and closing the first flow path, and the second electromagnetic valve being provided on the second flow path and opening and closing the second flow path, and the controller is configured to operate the syringe (103, 208), the first electromagnetic valve, and the second electromagnetic valve such that a predetermined aspirating, dispensing and discharging liquid operation is performed in the container, the liquid discharging unit, and the flow path system and wherein the controller is further configured to determine whether or not an abnormality occurs in the flow path system based on a difference between a. a predetermined threshold or a liquid amount measured by the sensor before the predetermined aspirating, dispensing and discharging liquid operation, and b. a liquid amount measured by the sensor after the predetermined liquid aspirating and discharging operation. a sensor configured to measure a liquid amount of a container containing liquid; a flow path system; a liquid discharging unit configured to discharge liquid from the flow path system; a syringe (103, 208) that is connected to a branch portion of the flow path system and configured to change an internal pressure of the flow path; and a controller, wherein the flow path system includes a first flow path, a second flow path, a first electromagnetic valve, and a second electromagnetic valve, the first flow path ranging from a nozzle to the branch portion, the nozzle aspirating or dispensing liquid from or to the container, the second flow path ranging from the branch portion to the liquid discharging unit, the first electromagnetic valve being provided on the first flow path and opening and closing the first flow path, and the second electromagnetic valve being provided on the second flow path and opening and closing the second flow path, and the controller is configured to operate the syringe (103, 208), the first electromagnetic valve, and the second electromagnetic valve such that a predetermined aspirating, dispensing and discharging liquid operation is performed in the container, the liquid discharging unit, and the flow path system and wherein the controller is further configured to determine whether or not an abnormality occurs in the flow path system based on a difference between a. a predetermined threshold or a liquid amount measured by the sensor before the predetermined aspirating, dispensing and discharging liquid operation, and b. a liquid amount measured by the sensor after the predetermined liquid aspirating and discharging operation. a. a predetermined threshold or a liquid amount measured by the sensor before the predetermined aspirating, dispensing and discharging liquid operation, and b. a liquid amount measured by the sensor after the predetermined liquid aspirating and discharging operation.