Curable composition

A curable composition comprising a curable compound represented by Formula (1) and a radical polymerization initiator:

• where R1 and R2 are each, identically or differently, a curable functional group, and D1 and D2 are each, identically or differently, a single bond or a linking group;
• L is a divalent group having a repeating unit containing a structure represented by Formula (I) and a structure represented by Formula (II):
• where Ar1 to Ar3 are each, identically or differently, an arylene group or a group in which two or more arylene groups are bonded via a single bond or a linking group;
• X is —CO—, —S—, or —SO2—;
• Y is each, identically or differently, —S—, —SO2—, —O—, —CO—, —COO—, or —CONH—;
• and n is an integer of 0 or greater,
• wherein the radical polymerization initiator is a peroxide or a peracid ester,
• wherein D1 and D2 in Formula (1) are each, identically or differently, a group selected from groups having structures represented by Formulas (d-1) to (d-4):