This paper analyzed office market rents in Japanese major cities such as Sapporo, Sendai, Tokyo, Nagoya, Osaka, Fukuoka, by using macro time series data. In each city, rents are determined by the balance between aggregate supply and aggregate demand in office rental market. Taking into account this market mechanism, this paper estimates a time-series model of rents on office rental markets in each city. The results show us the significant relationship between rent and the No. of workers in almost all cities, but never gained significant relationship of aggregate supply and labor productivity.