To provide a wood pellet fuel combustion device capable of properly burning wood pellet while preventing adhesion of ash and soot scattering in a space of a combustion chamber to an inner side of heat-resisting glass of an inspection window, preventing adhesion of tar to an inner surface of the heat-resisting glass by circulating and spraying a part of the combustion wind of high temperature as it is, as the wind sprayed to the inner surface of the heat-resisting glass, preventing lowering of a temperature of the combustion chamber, and further controlling the generation of tar.

This wood pellet fuel combustion device comprises the transparent or translucent heat-resisting glass disposed at least at a front side of the combustion portion, and a blowing-out portion for supplying the air toward an inner surface faced into the combustion portion, of the heat-resisting glass, and further comprises a circulating passage communicating a discharge portion and a blowing-out portion of the combustion wind. A part of the combustion wind discharged from the discharge portion of the combustion wind is supplied to the circulating passage, and the supplied combustion wind is blown out from the blowing-out portion toward the inner surface of the heat-resisting glass.

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