PURPOSE: To finish clothes to be dried without generating wrinkles and with low electrical expenses and without decreasing a service life in a reservation operation.

CONSTITUTION: This dryer is a clothes dryer of drum type, and also, it is provided with a function to reserve drying finishing time, and when reservation is set, a search operation to decide required drying operation time is operated by detecting the amount and wetness of clothes to be dried, thereby, an operation can be performed without leaving a time before finishing time, therefore, it is possible to drive without generating interruption, or without performing a finishing operation to heat the clothes to be dried cooled due to the interruption again by deciding the start time of a drying operation by performing an invers operation from reservation time based on the data of the search operation.