Film forming apparatus and film forming method

A film forming apparatus comprising:

• an anode;
• a solid electrolyte membrane that is arranged between the anode and a 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;
• 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;
• and
• a liquid storing portion provided between the anode and the solid electrolyte membrane, the liquid storing portion storing an electrolytic solution that contains the metal ions in a manner such that the electrolytic solution contacts the anode and the solid electrolyte membrane, wherein
• the liquid storing portion includes a liquid supply port that supplies the electrolytic solution into the liquid storing portion, and a liquid discharge port that discharges the electrolytic solution from within the liquid storing portion, the liquid supply port and the liquid discharge port being provided such that the electrolytic solution flows between the anode and the solid electrolyte membrane, wherein
• the liquid discharge port is provided in a position higher than the liquid supply port, wherein
• a surface of the anode that faces the solid electrolyte membrane is inclined upward with respect to a horizontal plane, in a direction from the liquid supply port toward the liquid discharge port.