The purpose of this study is to examine characteristics of unpaid family workers in family-owned businesses and to determine factors associated with their job satisfaction. Analyses of unpaid family workers from whom Korea Labor and Income Panel Study(KLIP) gathered data in 2000 were used to accomplish this. According to these analyses, the important factors in predicting job satisfaction are the age of unpaid family worker, household income, hours of work in a week size of family-owned business, and job classification.