To provide an inexpensive waste incinerator which allows a fixed amount of waste to be continuously thrown in a combustion chamber in a state where the waste is isolated from the outside air, does require any large installation area, and can be operated easily.

A waste incinerator which has a combustion chamber 30 inside and incinerates waste 1 in the chamber 30 is provided with a charge port 30a which is provided in the upper section of the chamber 1 for charging the waste 1 in the chamber 30, a charge lid 22 for opening and closing the port 30a, a hopper 10 for carrying the waste 1 to the port 30a, and a hopper opening which is provided to the hopper 10 and faced to the charging port 30a when the hopper 10 is lifted to the vicinity of the port 30a for discharging the waste 1 toward the chamber 30 from the hopper 10.