Stool flushing device

An object of the present invention is to provide a toilet cleaning device which is capable of cleaning a toilet stool by supplying cleaning water in an appropriate quantity corresponding to the state of usage by a user, which is provided with a self-diagnosis function for diagnosing cleaning water stoppage or the like, and which has a simple constitution so that maintenance can be performed easily. The output of a Doppler sensor is amplified by an amp , and a frequency spectrum is determined by an FFT calculation portion . A flow rate is determined by conversion in a flow rate calculation portion on the basis of the frequency spectrum. A controller operates other devices on the basis of the flow rate calculated by the flow rate calculation portion and the operational state of a cleaning instruction button . Cleaning water supply valve is opened and closed in accordance with instructions from the controller . Electrolyzed water is generated in an electrolyzed water generating portion to prevent the formation of urinary calculus in a drainpipe, and this electrolyzed water is discharged from a water spout when an electrolyzed water supply valve is opened.