AUTOMATIC ANALYZER

An automatic analyzer, which prevents cross contamination, has a sample dispensing probe washing mechanism 81, a reagent dispensing probe washing mechanism 82 and an agitation mechanism washing mechanism 83 that are individually controlled. A washing liquid discharge quantity for dispensing probes 42 and 52 and a reserved quantity of the washing liquid for a washing bath are acquired on the basis of detection signals fed from corresponding liquid flow detectors 111, 112, 113, 114, 115 and 116 and liquid level detectors 121 and 122. The washing liquid discharge quantity and the reserved liquid quantity are compared with predetermined reference values thereby monitoring whether or not the feed of the washing liquid to the dispensing probes 42 and 52 and the reservation and discharge of the washing liquid in the washing bath are abnormal. An anomaly is reported by a printer 108 or a CRT 106.