Properly using condoms is one of the most effective types of protection against HIV. To clarify the contents of normative beliefs regarding purchasing and using condoms, 390 undergraduate student volunteers were surveyed. The exploratory and confirmatory factor analyses revealed that both males and females held two types of normative beliefs, namely formal normative beliefs and informal normative beliefs, regarding purchasing and using condoms. Formal normative beliefs were concerned with the necessity of condoms on the one hand, while informal normative beliefs were concerned with private norms within reference groups on the other. Moreover, a t-test revealed a significant gender difference in formal normative beliefs regarding purchasing condoms, with females regarding purchasing condoms as less necessary than males did. These results were discussed from the view of HIV prevention education.