PROBLEM TO BE SOLVED: To provide a method of disinfecting and drying plant seeds in which seeds can be dried in high heat efficiency for a shot time, as the plant pathogenic microbes sticking to the seeds are disinfected safely to human bodies without adverse effect on the germination and the like. SOLUTION: The drying chamber is kept at a reduced pressure by controlling the aspiration from the outside and the exhaustion toward the outside, the seeds are fed thereto batchwise or continuously and the seeds are radiated with far-infrared rays from far-infrared heaters, while the air heated with the far-infrared rays is forcedly circulated in the drying chamber whereby the seeds are brought into contact with the circulated air flow and disinfected and dried.
