An up-drawing continuous casting apparatus includes a holding furnace (101) that holds molten metal (M1), and a shape defining member (102) that is set near a molten metal surface of a molten metal (M1) held in the holding furnace (101), and defines a- sectional shape of a casting (M3) to be cast, as the molten metal (M1) passes through the shape defining member (102). The shape defining member (102) is able to be switched between a joined state and a partitioned state. With such a structure, it becomes possible to form a casting having a branched structure.