This paper aimes to clear the structure of available field of assembly facilities from the viewpoint of differences by its location and its organizer. The conclusions are as follows ; 1) The structure of available field of public assembly facilities differ from private one. The former shoes centralization structure, and the latter shows relatively breakup structure. 2) The differences reflect the difference of constituents between public assembly facilities and private one. 3) The structure of available field of assembly facilities changes by its seazonal zone and its open time and its function. 4) Collectively, the available field of public assembly facilities is within 2 km.