Abstract: A continuous casting plant for the optional casting of an ingot of slab cross section or of ingots of smaller cross section has a first structural unit which is developed as plate mold for the casting of an ingot of slab cross section. This structural unit is supported on a mold support structure (1) and can be replaced by a second structural unit (16) having molds (21, 22, 23) for the casting of ingots of smaller cross section. For the dependable supporting of the molds (21, 22, 23) for the casting of a smaller cross section, the second structural unit (16) is formed of two longitudinal girders (17, 17') which are arranged spaced from and approximately parallel to each other and are rigidly connected to each other, the molds (21, 22, 23) being supported on the longitudinal girders (17, 17').