A vehicle tiredness alleviating system provided with at least one of a vehicle air-conditioning system for controlling a temperature in a passenger compartment, a seat heating system for heating the surface of a seat, and a seat vibration system for repeatedly vibrating a seat for a predetermined time, further provided with a means for judging the tiredness degree of a passenger seated on a seat in the passenger compartment and a means for performing at least one of temperature control of the vehicle air-conditioning system, temperature control of the seat heating system, and control of the vibration strength or vibration time of the seat vibration system.