This study developed a scale that measures situational factors affecting marital decision and verified its validity and reliability. Twelve items yielded from the preliminary study was evaluated by experts to obtain content validity. Through this process, the Marital Decision Situational Factors Scale, consisted of eight items, was confirmed. Data was collected from adult men and women in Seoul and Gyeonggi Province (N = 159, men = 68, women = 91), and construct validity of the measure was confirmed by the exploratory factor analysis and the confirmatory factor analysis. Reliability of the measure tested by the internal consistency of the scale items (Cronbach's a) was .77. The exploratory factor analysis and the confirmatory factor analysis yielded 3-scale structure: familial and social conventional effects, pursuit of emotional intimacy, and a sense of reality about marriage. Convergent validity was obtained by testing the correlation among the Marital Decision Situational Factors Scale, the Mate Selection Internal Factors Scale, and the Mate Selection External Factors Scale. Predictive validity was confirmed by analysing if situational factors predicted a level of marital decision. In the end, the implications and limitations of this research and suggestions for further research were presented.