To provide a roasting apparatus for consequently roasting grain crops by heating, capable of avoiding roasting unevenness and heating the grain crops along a fixed temperature/time curve in an excellent heat efficiency.

A hot air supplying mechanism 5 is installed below an aerating bed 2, a fluidized bed 13 of grain crops is formed on the aerating bed 2, the aerating bed 2 is divided into plural zones in the treatment direction from one supply side of raw material grain crops to the other discharge side of roasted grain crops so to separately adjust the temperature of hot air from the hot air supplying mechanism 5, plural moving walls 10 traveling from the supply side to the discharge side through each zone along the aerating bed 2 is arranged with facing the treatment diameter to constitute a transporting mechanism for a material to be treated and a mechanism 12 for supplying the material to be treated, capable of supplying the raw material grain crops to between the moving wall 10 at the top upstream side in the treatment direction and the moving wall 10 at the downstream side adjoining the moving wall is installed. Both the moving walls are the aerating bed may be constituted movably in the treatment direction.