Curable compound

A curable compound having characteristics (a) to (e):

• (a) a number average molecular weight, calibrated with polystyrene standard, is from 1000 to 15000;
• (b) a proportion of a structure derived from an aromatic ring in a total amount of the curable compound is 50 wt. % or greater;
• (c) solvent solubility at 25° C. is 1 g/100 g or greater;
• (d) a glass transition temperature is 280° C. or lower;
• and
• (e) a 5% weight loss temperature (Td5) of a cured product of the curable compound, measured at a rate of temperature increase of 10° C./min, in nitrogen, is 300° C. or higher,
• wherein the curable compound is a compound represented by Formula (1):
• where, R1 and R2 are identical or different, and each represent a group selected from groups represented by Formulas (r-1) to (r-6):
• where, a bond from a nitrogen atom in each formula bonds to D1 or D2,
• D1 and D2 are identical or different, and each represent a single bond or a linking group selected from groups having structures represented by Formulas (d-1) to (d-4):
• and L represents a divalent group represented by Formula (L-1-2):
• where, m2 represents a number from 2 to 50.