A control device for controlling heat applied to a medium conveyed along a path, includes: first and second heaters arranged along a first direction crossing the path, the first heater overlapping the medium and the second heater not overlapping the medium when viewed in a direction crossing the path and the first direction; a sensor; and a circuit configured to determine estimated temperatures of the heaters based on power supplied thereto, determine a corrected temperature of the first heater based on the estimated temperature thereof and a temperature measured by the sensor, determine a corrected temperature of the second heater based on the estimated temperature thereof and the corrected and estimated temperatures of the first heater, energize the heaters based on the corrected temperatures, and issue a command for controlling a conveying speed based on the corrected temperature of the second heater.