The invention relates to a tableware washer having a storage part for storing washings, and a washings jetting mechanism, the jetting mechanism jets the washings stored in the storage part to objects to be washed in a washing tank to clean the objects. The washer comprises a turbidity detection part, which is located at a position higher than a water level of residual water of the washings storedin the storage part, and used for detecting the turbidity of the washings. The washer further comprises a control part for adjusting a detected value of turbidity to be a reference value before a period of cleaning via action of the washings jetting mechanism, and then, setting a cleaning condition according to the turbidity of the washings. Thereby, dreggy degree of the objects to be cleaned canbe accurately detected for long time.