PURPOSE: To obtain a unified silo composed of a plurality of tanks which can store separately a plurality of kinds of contents and also can hold a large quantity of contents even in a narrow building site.

CONSTITUTION: A unified silo is provided with four vertical tanks 4a, 4b, 4c, 4d storing coal respectively and it is a clover-shaped silo 2 formed by concrete as a unit. It is radially formed from the center of the silo in plan view and provided with four partitions 6ab, 6ac, 6cd, 6bd dividing the tanks 4a, 4b, 4c, 4d and external walls 8a, 8b, 8c, 8d connecting the sides of the adjacent two partition walls. The external walls 8a, 8b, 8c, 8d are curved outward in plan view and smoothly connected to the sides of the partitions 6ab, 6ac, 6cd, 6bd.