The purpose of this study is to analyze the pattern of the block size and clarify the distinction of the three districts, zoned by the difference of the development times, through the "Mizucho Ezu" in the Edo era. In the north Simanouchi, the inside measurement of the block was 40. 5ken from south to north. On the centers, it was 44. 5ken. In the south Simanouchi, the inside measurement was 42 ken. On the senters, it was 45ken. However, in the old Mittera village area, the inside measurement of the block and the wide of the front road were different from other districts.
