A three-dimensional net includes front and rear base nets interconnected with connecting yarn with a predetermined space therebetween. The front and rear base nets each include braid parts forming a meshed structure which presents mesh openings bounded by intersections of the braid parts, each of the braid parts including at least one wale. The mesh openings of a first of the front and rear base nets is larger than the mesh openings of a second of the front and rear base nets, and the front and rear base nets are connected together by passing the connecting yarns between all the braid parts of the first base net and a corresponding portion of the braid parts of the second base net in positions opposed to the braid parts of the first net. As such, a remaining portion of the braid parts of the second net, which subdivide areas bounded by the corresponding braid portion of the braid parts connected to the first braid net by the connecting yarns, and which thereby form smaller mesh openings in the second net, are not connected by the connecting yarns with the braid parts of the first net. In another embodiment, both the front and rear base nets have mesh openings of equal size, and are connected together by passing the connecting yarns between a portion of the braid parts which bound areas each including at least two mesh openings, a remaining portion of the braid parts subdividing the bounded areas.