Cells are embedded in a high density, contact with extracellular matrix components optionally cells, control of the three-dimensional form, tissue shape maintenance after the hydrogel is removed, efficient proliferation and cell-cell interactions cells in tissue formation and capable of uniform seeding of cells into tissues inside, provides a method for obtaining a fibrous protein material. Fibrous protein material forming method according to the invention comprises an inlet for introducing a first aqueous solution of sodium alginate and proteins are dissolved, an inlet for introducing the gelling agent solution, an inlet passage which is connected to the inlet, the inlet a merging flow path flow path are merged, to channel structure having an outlet located downstream of the confluent channel, continuously introducing a first aqueous solution and gelling agent solution in the flow channel structure, channel structure in the interior of the first aqueous solution is continuously gelled to form a hydrogel, the external or internal channel structure, the proteins contained in the hydrogel is chemically crosslinked, the alginic acid contained in the hydrogels Remove.
