To reduce the amount of garbage to be collected remarkably.

A garbage charging container 1 in which a garbage charging port 5 is formed in the upper part, a garbage take-out opening is formed in the lower part, and deodorizing air exit 8 is formed at a proper position, a garbage stirring screw 14 installed freely rotatably in the container 1, and a driving source 20 for rotating the screw 14 are provided. In the screw 14, the radius of the screw blade 16 is decreased upward, and the blade 16 is nearly conical in a side view.