To provide a groundbreaking small solid fuel combustion device having a conveying mechanism free from powderizing phenomenon due to collision and friction of small solid fuels in conveying the small solid fuels, in the small solid fuel combustion device in which the small solid fuels such as woody pellet are conveyed upward from a fuel tank by using the conveying mechanism.

A drum-shaped rotating body is rotatably disposed on the conveying mechanism, a rotating/driving mechanism is disposed to rotate and drive the rotating body, a plurality of partitioning plates are projected inside of the rotating body rotated by the rotating/driving mechanism at intervals to form a receiving section for receiving the small solid fuels, and the small solid fuels fall on a fuel supply section from the receiving section, and are further supplied from the fuel supply section to a combustion section, when the receiving section is raised by the rotation of the rotating body and reaches the fuel supply section.