Two hundred and eleven undergradua te students (female 149, male 62) were administered three tests to investigate relationship between vividness of mental i magery and personality. Those tests were SMI-S (Scale of Mental Imagery-Short fo rm), Y-G (Yatabe-Guilford) Personality Test and MPI (Maudsley Personality Invent ory). Some correlations were obtained among the item scores of SMI-S, the trait scores of Y-G Personality Test and the scale scores of MPI. Investigated by the factor-analysis of the correlations, three factors were extracted and were interpreted a s the factors of “vivid mental imagery and adjusted personality”,“extraversion-introversion” and “adjusted personality”. The high vivid mental images by SMI-S showed higher tr ait scores on General Activity and Social Extraversion of Y-G Personality Test than on those of the low vivid mental images. It was suggested that vivid mental imagery were related with adjusted, un-neurotic and extravert personality.