PROBLEM TO BE SOLVED: To provide a drowse prevention device that prevents drowse of an occupant seated on a vehicle seat, the drowse prevention device being able to shorten time taken for the occupant to become awake.;SOLUTION: A drowse prevention device 1 has: a stimulating part 10 disposed in a head rest 33 of a seat 30; and a control device 50 that controls actuation of a Peltier element 17 of the stimulating part 10. The stimulating part 10 has, in the head rest part 33: a contact part 11 disposed so as to allow contact with an occupant P seated on the seat 30; and the Peltier element 17 as a heat source for changing a temperature of the contact part 11. In a case where it is determined in a drowse danger determination process that there is a danger of drowse of the occupant P, the actuation of the Peltier element 17 is controlled in order to give a temperature stimulus by bringing the contact part 11 into contact with the occupant P.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT
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