To provide an inexpensive temperature controller and deodorizing device which have stable temperature control performance.

The temperature controller is equipped with a heater part 6, a heater driving part 5 which drives the heater part 6, an air blower part 4 which has an air blower, a controller part 3 which controls the heater driving part 5 and air blower part 4 by performing arithmetic processing and outputting a command signal, a power source part 2 which supplies electric power, and an operation part 7 which sets the set temperature of a hot blast from the heater part 6 and the operation pattern of the air blower, and controls the control part 3 to stabilize the temperature at a specific control point of a controlled system at the set temperature; and the controller part 3 has a function of finding the optimum quantity of electrification to the heater part 6 through arithmetic processing based upon the set temperature and the operation pattern of the air blower and outputting the arithmetic value as the command signal to the heater driving part 5.