A thermal stimulation apparatus for vehicles capable of exerting an effect of, for example, reducing fatigue and improving the physical condition of a vehicle occupant. In a vehicle thermal stimulation apparatus 10, the piezoelectric sensor 26 detects a biorhythm accompanying a periodic change in an occupant, a control circuit 16 switches on and off heater elements 22, 24 on the basis of the detection result of the biorhythm detector such that by the heater elements 22, 24 being switched on and off, thermal stimulus to the occupant is synchronized with the biorhythm of the occupant. It is thereby possible to exert effects of, for example, reducing fatigue and improving the physical condition of a vehicle occupant.