Ink for forming coating film of optical member, and optical member

An ink for forming a coating film of an optical member, comprising:

• a black pigment;
• at least one of a colored pigment or a colorless pigment;
• a binder;
• and
• a volatile component,
• wherein, with regard to each of the black pigment, the colored pigment, and the colorless pigment, an average refractive index n in a wavelength range of 400 nm to 700 nm is 2.00 or more,
• with regard to each of the black pigment and the colored pigment, an average attenuation coefficient k is 0.10 or more, and
• a total mass ratio of the black pigment, the colored pigment, and the colorless pigment in a total solid content is 6.5% by mass to 25.8% by mass.

An optical member comprising:

• a base material of an optical member;
• and
• a coating film of an optical member, provided on a part of the base material of an optical member,
• wherein the coating film of an optical member contains a black pigment and at least one of a colored pigment or a colorless pigment,
• an average refractive index n of the coating film of an optical member in a wavelength range of 400 nm to 700 nm is 1.70 or more, and an average attenuation coefficient k of the coating film of an optical member in the wavelength range of 400 nm to 700 nm is 0.10 to 0.15, and
• a total ratio of the black pigment, the colored pigment, and the colorless pigment in an entire volume of the coating film of an optical member is 10% by volume to 40% by volume.