Recent studies have indicated that factors affecting social anxiety are fear of positive evaluation (FPE) and self-oriented perfectionism in addition to fear of negative evaluation (FNE). This study focused on social anxiety when making speeches and presentations, and examined the effects of FNE, FPE and self-oriented perfectionism on social anxiety. A survey was conducted with high school and university students. Results indicated FNE and FPE directly increased social anxiety. Moreover, concern over mistakes (CM) indirectly increased social anxiety via FNE and FPE. Furthermore, doubting of action directly increased social anxiety and indirectly increased social anxiety via FNE. Also, CM directly increased social anxiety only in university students, whereas desire for perfection directly decreased social anxiety only in high school students.