PURPOSE: To reduce remarkably the pollution of drain of a kitchen by forming independent passages to a plurality of openings provided to the sink, making one way of each of the passages communicate with a garbage storage tank and, at the same time, making a drying means communicate with the garbage storage tank.

CONSTITUTION: In the case a kitchen sink is used, a cock body 20 is removed from an opening 8C, and vegetable garbage, etc., are thrown into a garbage disposal 22 from the opening 8C. After that, small pieces of trash, etc., dropped in a sink 6 are collected by a filter body 14 or a filter body loaded in a chamber 16, and they are thrown in the opening 8C at any time. Then, the disposal 22 is equipped with a detachable garbage storage tank and a ventilating means, air absorbed from an inlet port is changed in hot-air to send it in the garbage storage tank, and garbage is dried. In addition, the hot air is exhausted to the outside through the filter body and a deodorizer. Drain is drained to a sewer from the chamber 16 through a drain 18. According to the constitution, a large amount of garbage in a drainage cage can be prevented from being exposed in drain, the pollution of drainage of the kitchen can be prevented, and it can be treated sanitarily.