Cleaning apparatus and an automatic analyzer

When performing B / F cleaning of the reaction solution caused the heterogeneous reaction, an abnormality of the liquid surface position of the reaction liquid contained therein reaction vessel can be detected accurately, maintenance also easy cleaning device and to provide an automatic analyzer. For this purpose, provided corresponding to each of the plurality of nozzles pairs of discharge nozzles for discharging a suction nozzle and a predetermined B / F cleaning fluid aspirating at least a portion of the reaction liquid, suction form the corresponding nozzle pairs a plurality of air nozzles for ejecting air from above the respective edge portion of the nozzle and the discharge nozzle, and an air supply means for supplying air collectively to the plurality of air nozzles, the air supplied from the air supply means the discharge nozzles in accordance with a change in the plurality of pressure sensors, pressure and pressure of air which said plurality of pressure sensor detects each for detecting each pressure of the air in the vicinity of the base end portion of the air nozzle a pressure and a control device which controls the ejection operation of the B / F washing solution separately.