Provided are a washing device and a washing method that can remove burnt body fluid adhered to a medical instrument. The washing device (100) can remove the burned component which adhered to a tip end portion (5a) of a surgical instrument (5) by applying a physical force caused by the pressure of cleaning agent-dissolved water (41) ejected from a cleaning nozzle member (2) in addition to a chemical force caused by a cleaning agent contained in the cleaning agent-dissolved water (41).
