Ink composition, light-blocking member and image display device

An ink composition, comprising:

• a light-shielding agent (A);
• a cationic polymerizable compound (B);
• a photoacid generator (C);
• and a sensitizer (D), wherein
• volume concentration of the light-shielding agent (A) with respect to total volume of a solid content of the ink composition is 0.3% or more and 12% or less,
• the cationic polymerizable compound (B) contains a metallic element-containing compound (B1) that includes a cationic polymerizable group and a hydrolyzable group,
• the metallic element-containing compound (B1) is selected from the group consisting of 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane, 3-[(3-ethyloxetan-3-yl)methoxy]propyl(trimethoxy)silane, 3-[(3-ethyloxetan-3-yl)methoxy]propyl(triethoxy)silane, 3-[(3-methyloxetan-3-yl)methoxy]propyl(trimethoxy)silane and 3-[(3-methyloxetan-3-yl)methoxy]propyl(trimethoxy)silane,
• a content of the metallic element-containing compound (B1) is 5 parts by mass or more and 80 parts by mass or less, where entirety of the solid content of the ink composition is 100 parts by mass, and
• the sensitizer (D) contains a compound (D1) having an anthracene skeleton.