A film forming apparatus includes: an anode; a solid electrolyte membrane that is arranged between the anode and an substrate that serves as a cathode, and that contains metal ions; a power supply that applies a voltage between the anode and the substrate in a state in which the solid electrolyte membrane is in contact with the substrate from above; and an oscillating portion configured to oscillate at least the anode in the state in which the solid electrolyte membrane is in contact with the substrate.