PROBLEM TO BE SOLVED: To provide an aquarium that restrains the propagation of algae to reduce a burden of maintenance such as cleaning work.SOLUTION: An aquarium comprises a front side plate 1 (11), a rear side plate 3 (13), left and right side plates 2 and 4 (12 and 14), and a bottom plate 5 (15). The front side plate 1 (11) is made of transparent glass, and the rear side plate 3 (13) and the left and right side plates 2 and 4 (12 and 14) are made of colored glass in which at least one side is white.