To provide a gasifying combustion system for a small-scale boiler allowed to use RPF (refuse paper and plastic fuel).

This solid fuel gasifying combustion system 10 comprises a fuel chamber 1 holding solid fuel S, and a hot air forming means 3 generating gasified fuel G from the solid fuel S in the fuel chamber and inducing the gasified fuel G into a combustion chamber 9. The hot air forming means 3 comprises a hot air forming tube part 4 forming introduced air A into hot air H in a process of carrying the air A toward the fuel chamber 1 through the combustion chamber 9 and exhausting the hot air H in the end, and a hot air reflecting part 5 turning the hot air H exhausted from the fuel chamber 1, around toward the combustion chamber 9. A boundary part between the fuel chamber 1 and the combustion chamber 9 is provided with a gasified fuel injection port 7 through which the hot air forming means 3 passes.