In a water tank set with a filter, which includes the filter (F) within a water tank main body (1), the water tank main body (1) is formed in a vessel-shape having an upper surface thereof opened, storage water being to be stored in the water tank main body (1), the filter (F) being provided in an interior of the water tank main body (1). The water tank main body (1) and a filter case (10) of the filter (F) are formed opaque and in a same color as each other. Accordingly, it is difficult for an appreciator who appreciates aquarium fish to see a filter, which is provided within a water tank, from outside of the water tank, thereby enhancing appreciation effects of the aquarium fish.
