Research on shyness in social and personality psychology suggests that shyness reflects one’s inferiority related to anxiety and inhibition in social contexts. Shy people tend to use more self-defeating humor and less affiliative humor than non-shy people in interpersonal relations (Hampes, 2005; 2006). It is commonly found that shyness is associated with deficit of self-esteem, which further mediates the effect of shyness on depression along with social support (Chan, 2012). The present study based on analysis of a recent Japanese student sample (N=198, 66.7% male) investigates whether those patterns are similar in Japan context. Results show that although shyness is associated with loneliness and affiliative humor (negatively), it has no significant correlations with self-defeating humor and self-esteem. The findings support that the negative functioning of shyness is not pan-cultural, since in some cultures like Japan, being shy is not necessarily associated with having low self-esteem. Social functioning of shyness needs to be studied based on cultural values and norms.