The purpose of this study was to investigate the generalization of the mere exposure effect in person perception. When positive affect was produced by repeated presentations of a photograph of the face of a stimulus person, it generalized about a similar person. Change in the subject's perception of the stimulus persor's personality on social desirability dimension also generalized in regard to a similar person, when the mere exposure effect was obtained. Regression analyses were performed to examine the relationship between the mere exposure effect and the change in personality perception. The results indicated that the change in personality perception was mediated by the mere exposure effect.