An automatic analysis apparatus comprising: a detection unit including a flow cell that accommodates a liquid serving as an analysis subject; a suction nozzle that sucks the liquid to be introduced into the flow cell; a container that accommodates the liquid to be sucked by the suction nozzle; a pump that supplies the liquid to the flow cell; a tank that stores the discharged liquid; an atmosphere releasing part for atmospheric releasing; and a table which places the container at a desired position; wherein the suction nozzle, the flow cell, the atmosphere releasing part, and the tank are connected in sequence via a flow channel for the liquid; the flow cell is placed at a position upper than positions of the container, the suction nozzle, the atmosphere releasing part, and the tank in a gravity direction; the atmosphere releasing part is placed at a position upper than a position of the tank in a gravity direction; characterized in that it further comprises: a power-cutting instructing unit that gives an instruction to cut a power supply to the automatic analysis apparatus; a control unit that executes first liquid supplying processing when the power-cutting instruction from the power-cutting instructing unit is not received, and that executes second liquid supplying processing when the power-cutting instruction from the power-cutting instructing unit is received; and in the second liquid supplying processing, the control unit cuts the power supply after supplying the liquid to the flow cell and operating the table to immerse the suction nozzle in the liquid contained in the container. a detection unit including a flow cell that accommodates a liquid serving as an analysis subject; a suction nozzle that sucks the liquid to be introduced into the flow cell; a container that accommodates the liquid to be sucked by the suction nozzle; a pump that supplies the liquid to the flow cell; a tank that stores the discharged liquid; an atmosphere releasing part for atmospheric releasing; and a table which places the container at a desired position; wherein the suction nozzle, the flow cell, the atmosphere releasing part, and the tank are connected in sequence via a flow channel for the liquid; the flow cell is placed at a position upper than positions of the container, the suction nozzle, the atmosphere releasing part, and the tank in a gravity direction; the atmosphere releasing part is placed at a position upper than a position of the tank in a gravity direction; characterized in that it further comprises: a power-cutting instructing unit that gives an instruction to cut a power supply to the automatic analysis apparatus; a control unit that executes first liquid supplying processing when the power-cutting instruction from the power-cutting instructing unit is not received, and that executes second liquid supplying processing when the power-cutting instruction from the power-cutting instructing unit is received; and in the second liquid supplying processing, the control unit cuts the power supply after supplying the liquid to the flow cell and operating the table to immerse the suction nozzle in the liquid contained in the container. a power-cutting instructing unit that gives an instruction to cut a power supply to the automatic analysis apparatus; a control unit that executes first liquid supplying processing when the power-cutting instruction from the power-cutting instructing unit is not received, and that executes second liquid supplying processing when the power-cutting instruction from the power-cutting instructing unit is received; and in the second liquid supplying processing, the control unit cuts the power supply after supplying the liquid to the flow cell and operating the table to immerse the suction nozzle in the liquid contained in the container.