This study, which follows a precedent empirical study, analyzes the pattern of apartment price variation by size caused by the beginning of Korean baby boomers retirement through the identification of price functions with transaction times as the independent variable. The facts found, which are generally similar to those of the precedent study, are summed up as follows; First, during the period from 2006 to 2012, the patterns of apartment price variation appear to be very different according to the size of apartment s dwelling space. Second, as a rule, the more spacious an apartment is, the longer the time span of price falling is. Third, therefore, it seems that the recent depression of housing market was originated from retiring baby boomers putting up their spacious apartments for sale. This study also suggests that more active policies are needed to induce effective demands for surplus housings and to lead the housing market to recover an equilibrium.