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 , 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 (C) 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 (C), 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 , 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 (C) 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 (C), 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 . <EOS>