Abstract: A graft is provided having a shell part that comes into contact with a body fluid when the graft is transplanted into a living body; and a core part that is located inside the shell part and does not substantially come into contact with the body fluid, in which the core part contains a plurality of first hydrogel fibers containing cells, the shell part contains a second hydrogel functioning as a semipermeable membrane, and the graft has a size with an outer diameter of greater than 1.5 mm.