Method of producing optical element forming mold and optical element forming mold

A method of producing an optical element forming mold, the method comprising:

• disposing a mold matrix in a film-forming chamber;
• and
• applying a voltage at a potential of +20 V to +100 V to a holding member so that the mold matrix is kept at a floating potential, or −100 V to 0 V,
• wherein:
• the mold matrix has a ring shape,
• an inner peripheral surface of the mold matrix is a film-forming surface,
• the holding member is disposed around the inner peripheral surface,
• the holding member holds the mold matrix via insulating members, and
• a magnetic field is formed so as to form a magnetic flux with a magnetic flux density of 0.002 tesla to less than 0.015 tesla toward a direction within ±30° with respect to a substantially normal direction of the film-forming surface of the mold matrix, and a tetrahedral amorphous carbon film is formed on the film-forming surface of the mold matrix while applying the voltage to the holding member.