Abstract: An artificial stone slab with integrally formed patterns and its manufacturing method that enables integrally forming patterns of various complicated shapes and colors in an artificial stone slab. The artificial stone slab includes a mixture prepared by mixing raw materials for artificial stone in powder state and a plurality of the patterns having various shapes and attached to a sheet. The sheet with the patterns is set to the inner side of a rubber mold. The powdered mixture is added into the rubber mold to integrally form the patterns with the mixture. The underlying sheet is removed to form an artificial stone slab with the patterns. The patterns are exposed only on the topside of the artificial stone slab or on both top and bottom sides of the artificial stone slab.