Abstract: Provided is a feeder (3) configured such that molten glass (G) is caused to flow through an inside of the feeder (3), the feeder (3) including: electric heating elements (6) arranged in an internal space (S) of the feeder (3) along a flowing direction of the molten glass (G), which are configured to heat the molten glass (G); and restricting portions (7) provided in a heat transfer path in which heat from the electric heating elements (6) reaches a surface (Ga) of the molten glass, which are configured to restrict the heat from being directly transferred to the molten glass (G).