Solid fuel burner and combustion device

This solid fuel burner (7) is provided with: a venturi tube (33) in which a channel (24) for mixed fluid in a fuel nozzle (21) narrows toward the center in the channel cross section; a fuel concentrator (34) that imparts, to the mixed fluid, a velocity component away from the center of the fuel nozzle (21); and a channel separation member (36) that separates the channel of the fuel nozzle (21) into an internal side and an external side; wherein the channel separation member (36) is shaped in such a way that the cross sectional area of an external channel (24a) is larger at the downstream end (S2) than at the upstream end (S1), and the upstream end (C1) of the fuel concentrator (34) is located between the upstream end (V3) and the downstream end (V4) of an expanded portion (33c) of the venturi tube (33). This solid fuel burner (7) prevents solid fuel particles, which is ground biomass fuel, from adhering and depositing inside the nozzle.