To provide a slurry reservoir tank in which the slurry stored in the tank neither affects the peripheral environment nor is affected by the peripheral environment and can be easily installed at a low cost.

The slurry reservoir tank 1 of a treatment facility 3 for making liquid manure by subjecting a slurry 2 (feces-urine mixture) to fermentation treatment is provided with: a body 5 formed of a sheet 4 in a bag form; an inlet 6 for injecting the slurry 2 into the body 5; and an outlet 7 for discharging the slurry 2 from the inside of the body 5. The cost is made lower than that of the conventional tanks made of concrete and steel or iron. The tank is made into the bag form to tightly seal the slurry, thereby preventing the slurry 2 from affecting the peripheral environment and from being affected by the peripheral environment. Further, the unexpected subsidence of the installation ground is made allowable by forming the sheet 4 into the bag form, and the installation of the tank 1 is made sufficiently possible on a cheap sand foundation even in case of a soft ground.

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