PURPOSE: To leak no smoke, smell and harmful gas indoor at the time of garbage combustion even if there is an abnormality in a furnace by housing a garbage treatment device incorporated in a sink in a frame to close with a front plate, communicating with the outdoor, but closely partitioning off the indoor.

CONSTITUTION: When a handle 17a of a front plate 17 is drawn, a guide rail 23 is guided by a slide rail 25 to move ahead, an exhaust cylinder 12a and an exhaust pipe 14 are separated by a movable connection part 22 in a combustion furnace 8 which is drawn out from a rear box body 18. An upper cover 7 in the combustion furnace 8 is opened, when the front plate 17 is pushed after garbage is charged and the inside of the combustion furnace 8 is communicated with the exhaust pipe 14. When an electric heater 9 in the combustion furnace 8 is switched on, the garbage is heated to incinerate and turned to ash. Air necessary for combustion is taken in an air supply blower 10, the exhaust gas produced by combustion is purified by a purifier 11, diluted and cooled in a dilute case 12 and is exhausted outdoor from the exhaust pipe 14 through the movable connection part 22. Since the movable connection part 22 is connected by a connection packing 21 without any gap, smoke and smell are not leaked even if incineration treatment is performed.