A die includes a die body, a material supply portion, and a slit portion. The material supply portion includes a material supply surface, and a material supply hole that extends in an extrusion direction from the material supply hole. The slit portion includes an extrusion surface that faces the material supply surface across the material supply hole, and a slit that has a grid shape, opens on the extrusion surface, and communicates with the material supply hole. The slit has a grid point. The material supply hole is provided at a position corresponding to the grid point and coaxially with the grid point. An end of the material supply hole in the extrusion direction includes a throttle hole whose diameter decreases toward the grid point, and a guide hole that extends outward from the throttle hole and guides a material to the slit including the grid point.