To smoothly carry out attachment and detachment of a rotation shaft to be attached in an garbage treatment apparatus.

A rotation shaft 31 for rotating in a fermentation chamber of a garbage treatment apparatus 1 is so supported as to be freely rotatable and detachable by a bearing 35 and a rotating mechanism part 10. Further, the bearing 35 is composed of a seat 36 fixed in a side wall, a movable bearing part 37 installed slidably to the seat 36, and an urging means installed in the inside of the seat 36 for urging the movable bearing part 37 and the rotation shaft 31 can be disassembled by moving of the movable bearing part 37.