The objects of this work is to develop a method of evaluating the thermal sensation of an automobile occupant and predicting its transition for the development of a new control system for automobile air-conditioners. An automobile air-conditioner is designed only to control the air-temperature of a passenger compartment. However, The most important factor in controlling automobile air-conditioner is the thermal amenity for occupants when an air-conditioner is controlled. For the control of the thermal amenity, it is necessary to quantitatively evaluate the thermal sensation of occupants.This paper presents a new method using neural networks, which was developed to evaluate the thermal sensation of an automobile occupant and to predict its transition from the occupant's skin temperature and temperature of the passenger compartment. Experiments were performed in an environmental chamber. Subjects with supplied clothes and thermocouples on their faces took automobile seats and voted their thermal sensation. The results showed an accuracy within 0.5 of the voting scales used. This accuracy is high enough to control an air-conditioner.