Coating composition and optical member

A coating composition comprising a component (M), a component (F), and a component (S), wherein

• the component (M) is at least one silicon-containing substance selected from the group consisting of hydrolysates of organosilicon compounds of general formula (I):
• (R1)a(R3)bSi(OR2)4−(a+b) (I)
• wherein each of R1 and R3 is a C1-35 alkyl group, an aryl group, a halogenated alkyl group, a halogenated aryl group, an alkenyl group, or an organic group having an epoxy group, an acryloyl group, a methacryloyl group, a mercapto group, a ureido group, an ether group, an amino group, or a cyano group, and is bonded to a silicon atom through a Si—C bond;
• R2 is a C1-8 alkyl group, an alkoxyalkyl group, or an acyl group;
• and each of a and b is an integer of 0, 1, or 2, and a+b is an integer of 0, 1, or 2;
• and general formula (II):
• [(R4)cSi(OX)3−c]2Y (II)
• wherein R4 is a C1-5 alkyl group;
• X is a C1-4 alkyl group or an acyl group;
• Y is a methylene group or a C2-20 alkylene group;
• and c is an integer of 0 or 1;
• the hydrolysates being obtained by hydrolyzing the organosilicon compounds of the general formula (I), the organosilicon compounds of the general formula (II), or both in the presence of the component (S) and the silicon-containing substance is contained in an amount of 20 to 85% by mass in the coating composition;
• the component (F) is a modified metal oxide colloidal particle (C) having a primary particle diameter of 2 to 100 nm, which includes a metal oxide colloidal particle (A) having a primary particle diameter of 2 to 60 nm as a core, whose surface is coated with a coating (B) formed of an acidic oxide colloidal particle having a primary particle diameter of 1 to 4 nm, and the colloidal particle (C) is contained in an amount of 10 to 60% by mass in the coating composition;
• the component (S) is an aqueous sol of a silica colloidal particle having a primary particle diameter of 2 to 80 nm as a catalyst, and is contained in an amount of 0.1 to 30% by mass in the coating composition;
• the metal oxide colloidal particle (A) is formed of an oxide of at least one metal selected from the group consisting of Ti, Fe, Cu, Zn, Y, Zr, Nb, Mo, In, Sn, Sb, Ta, W, Pb, Bi, and Ce;
• the coating (B) is formed of an acidic oxide of at least one metal selected from the group consisting of Si, Zr, Sn, Mo, Sb, and W, and
• the component (S) has a pH of 1 to 6.