The purpose of this study is to provide basic data for a desirable bathroom planning of apartments. This study explores the changes of the bathroom planning and analyzes the bathroom plans of the existing apartments. The collected data are 197 cases of the bathroom plans of the apartments (area:10-69 pyung) constructed in Kangnam Gu. Seoul between 1973-1993. where 47.624 households live. This study consists of an overview on the changes of the bathroom planning by the decade and findings on the bathrooms and dressing rooms of the present apartments. The numbers, location, size and proportion of the bathroom and dressing room and the direction of the bathroom door are examined in turn. For the better planning of the bathroom. factors like family size, life cycle, and manner of bathroom use should be analyzed in the future studies. The analysis of the bathroom plans of the apartments in the entire city of Seoul maybe a prerequisite to them.