To provide an inspection window allowing a person to observe a combustion condition of sawdust and wood shavings charged into an incinerator main body.

This incinerator burns sawdust, wood shavings or the like caused by machining wood. It is provided with a tube 9 extending in the outward direction from an incinerator main body 1, and transparent glass 11 is fitted in a tip of the tube 9 to allow the person to see the inside of a combustion chamber. An air pipe 10 is connected with a halfway part of the tube 9, air is supplied into the tube from the air pipe 10, and the air in the tube flows into the combustion chamber in the incinerator main body 1.