An automobile high-temperature pest extermination device, configured to apply, for a predetermined interval, heated air which has been heated to a pest extermination temperature to a to-be-treated automobile which is housed in a freely accessible manner in a treatment chamber to exterminate pests inside the automobile, comprising: a treatment chamber including an inlet and an outlet, which comprise openable and closable door parts (22a, 23a), the treatment chamber being configured that in its inside heated air which has been heated to a pest extermination temperature is applied to an enclosed space in which a to-be-treated automobile is self-propelled and accommodated, a circulation fan device arranged in the treatment chamber, and including a suction part, a discharge part, and a fan member, the fan member comprising a large propeller fan, and the front side of the fan member being oriented toward the inside of the treatment chamber, the circulation fan device being configured so that air in the treatment chamber is suctioned from the front side thereof via the suction part, and the suctioned air is discharged in both side directions via the discharge part on the rear surface of the fan member, and so that an air speed of the heated air from preferred 4 to 7 m/sec is provided, a heating member mounted in the discharge part of the circulation fan device, the heating member being configured to heat discharged air, a rectification member for adjusting, in the horizontal direction, the flow direction of the heated air delivered into the chamber via the heating member, chamber interior temperature detection means configured to detect a chamber interior temperature of the treatment chamber, vehicle interior temperature detection means configured to detect a vehicle interior temperature of the to-be-treated automobile, and heating temperature control means configured to control a heating temperature of air discharged from the circulation fan device and a treatment time based on the chamber interior temperature detection means and the vehicle interior temperature detection means. a treatment chamber including an inlet and an outlet, which comprise openable and closable door parts (22a, 23a), the treatment chamber being configured that in its inside heated air which has been heated to a pest extermination temperature is applied to an enclosed space in which a to-be-treated automobile is self-propelled and accommodated, a circulation fan device arranged in the treatment chamber, and including a suction part, a discharge part, and a fan member, the fan member comprising a large propeller fan, and the front side of the fan member being oriented toward the inside of the treatment chamber, the circulation fan device being configured so that air in the treatment chamber is suctioned from the front side thereof via the suction part, and the suctioned air is discharged in both side directions via the discharge part on the rear surface of the fan member, and so that an air speed of the heated air from preferred 4 to 7 m/sec is provided, a heating member mounted in the discharge part of the circulation fan device, the heating member being configured to heat discharged air, a rectification member for adjusting, in the horizontal direction, the flow direction of the heated air delivered into the chamber via the heating member, chamber interior temperature detection means configured to detect a chamber interior temperature of the treatment chamber, vehicle interior temperature detection means configured to detect a vehicle interior temperature of the to-be-treated automobile, and heating temperature control means configured to control a heating temperature of air discharged from the circulation fan device and a treatment time based on the chamber interior temperature detection means and the vehicle interior temperature detection means.