To treat night soil without using heat.

The urine is sterilized by an ultrasonic wave generator 45 for sterilization of a first chamber 37, is cleaned by resin honeycomb pipes 46, etc., of a second chamber 38 and is atomized by a plurality of ultrasonic wave generators 47, etc., for atomizing of a third chamber 39. Since the urine is subjected to the sterilization treatment, its smell may be suppressed. The urine is atomized by ultrasonic waves and is then released. Since there is no need for using thermal energy as compared with the device for evaporating the urine by a heater, this device is cost effective.