To facilitate incorporation into a small-sized grain drier without the need for providing a hot air path with a large capacity and allow grain to be dried by effectively using energy by far infrared rays so as to enhance energy-saving effects.

The inside of a drier main body is provided with the upper-stage storage part, the middle-stage drying part and the lower-stage grain collecting part, and the inside of the drying part is provided with two grain flow paths that are partitioned by a ventilating member to provide communication between the storage part and the grain collecting part. A hot air path is provided between two grain flow paths, and there is provided a partitioning member partitioning the inside of the storage part in the tip side of the hot air path. The front side of the drier main body of the drying part is provided with a burner, and the rear side of the drier main body is provided with an exhauster. There is provided a combustion chamber part forming a tubular combustion chamber communicating with the burner and opening into the direction from the front side of the drier main body to the rear side of the drier main body, and the outer periphery location in the open side of the combustion chamber part is provided with a far infrared radiator extending from the front side of the drier main body to the rear side of the drier main body in the hot air path. The far infrared radiator is additionally provided with a return pipe function returning the hot air supplied from the front side of the drier main body to the rear side of the drier main body to the front side of the drier main body.