The invention provides a measure that can readily prevent arthropod-borne diseases such as malaria that are contracted by 3 to 5 hundred million people worldwide yearly and that cause death of as many as 1.5 to 2.7 million people. By spraying in advance on the skin an arthropod-borne disease preventive agent or the like comprising chlorine dioxide as an effective component thereof, it is possible to provide repelling effect against arthropods such as infected mosquitoes that bear malaria protozoa and also to prevent biting of the skin by the arthropod, thus reducing contraction of the arthropod-borne diseases.
