A crushing drying device (10) includes an object-to-be-treated supply port (30) from which an object to be treated (O) is supplied into a device main body (11), a crushing portion (12) for crushing the object to be treated (O) supplied from the object-to-be-treated supply port (30) by hammers (20) rotated on a drive shaft (24), and a classifying portion (13) having a space for circulating the object to be treated (O) crushed in this crushing portion (12) at a position away from the crushing portion (12), the crushing portion (12) has a dry gas supply port (40) from which the heated air (A) is supplied in a predetermined direction along an inner surface of the device main body (11), and the classifying portion (13) has discharge portions (15) from which the crushed object to be treated (O) is discharged together with the heated air (A) supplied from the crushing portion (12), and deviation plates (60) for changing a flow of the object to be treated transferred to the classifying portion together with the heated air (A), so that the crushing drying device capable of crushing in accordance with the object to be treated and drying the crushed object to be treated by one machine is formed.