To provide a combustion apparatus of a solid fuel that forms a stable combustion layer, improves combustion efficiency, and is automated by the automatic supply of fuel.

A plurality of primary air exhaust ports 6 in the perpendicular direction leading to the inside of a flue 1 are formed on a hearth 3; a blower 7 for jetting out primary air from the primary air exhaust ports 6 into the flue 1 is provided; a cylindrical body 5 for discharging ash that faces upper and lower directions and allows the upper section to be open in the flue 1 is provided at the center of the hearth 3; a plurality of secondary air exhaust holes 10 are formed on the sidewall of the flue 1 so that they nearly face the tangential direction of the inner periphery of the flue 1; a blower 12 for jetting out secondary air in the flue 1 from the secondary air exhaust holes 10 for generating a swirling flow is provided for composing a boiler A; a screw feeder 18 is arranged at the bottom of a main hopper 17; and scratch-off means 26, 27 that are driven so that they approach and/or retreat from the screw feeder 18 and collect a solid fuel in the main hopper 17 onto the screw feeder 18 when approaching are provided in the main hopper 17, thus composing a supply device B.