To improve the operating efficiency.

This dryer comprises a burner 21 and a blower 23 for supplying hot air to a hot air chamber 11, and the blower 23 supplies the hot air toward the chamber 11 and cools the burner 21. After the drying operation is finished, the blower 23 supplies the air to the burner 21 for a predetermined time. After the drying operation is finished, when the atmospheric temperature B°C near the burner 21 becomes the temperature within an allowable range higher by α°C than the atmospheric temperature A°C near the burner 21 before the operation is started or the lapse of the set time from the time of ending the operation is earlier, the blower 23 is stopped.