PURPOSE: To provide a liquid reservoir with structural durability improved by coupling a bottom and sides of a reservoir body together with a table for supporting them into a single unit.

CONSTITUTION: A groove-shaped steel 4 is placed with a liner integrally molded perpendicularly in a lengthwise direction so as to close an end face on a lengthwise end face under a panel-assembled type liquid reservoir body 1, wherein a coupling plate 5 bent in an L-shape from an outer face of the liner and a flange side 2c of a side wall panel 2 which intersect with and are adjacent at a corner of the reservoir body 1 is joined to have both coupled to each other. By integrally coupling the reservoir body and a table, rigidity against a stress caused in a horizontal direction of the reservoir and fluctuation can be improved.