This study was conducted to determine the effect of major-related volunteering on self-esteem and self-efficiency in fifty three university students who are majoring in occupational therapy. Students volunteered for 20 days in the geriatric service center for dementia from July 27, 2009 to August 21, 2009. Questionnaire survey was conducted to determine the difference in, self-efficiency, career awareness before and after the volunteering. Student showed satisfaction to volunteer program in general, and self-esteem and self-efficiency improved from $29.43{pm}2.51$ point and $30.45{pm}3.41$ point to $31.66{pm}2.63$ point and $33.26{pm}3.93$ point, respectively. In addition, subjects expressed comfort toward occupational therapy and were able to recognize how to prepare the role of occupational therapist after graduation. These results indicates that occupational therapy-related volunteering was effective in understanding occupational therapy and improving career awareness.