A curable compound product comprising a compound represented by Formula : where R 1 and R 2 are identical or different, and each represent a group represented by Formula (r-1) or a group represented by Formula (r-2): where Q represents C or CH, and two Q's in Formula (r-1) and Formula (r-2) bond to each other through a single bond or a double bond; R 3 to R 6 are identical or different, and each represent a hydrogen atom or a hydrocarbon group; R 3 and R 4 may bond to each other to form a ring; n' represents an integer of 0 or greater; and a bond with a wavy line is bonded to D 1 or D 2 , where D 1 and D 2 are identical or different, and each represent a single bond or a linking group; and L represents a divalent group having a repeating unit containing a structure represented by Formula (I) and a structure represented by Formula (II): where Ar 1 to Ar 3 are identical or different, and each represent a group in which two hydrogen atoms are removed from an aromatic ring structure or a group in which two hydrogen atoms are removed from a structure in which two or more aromatic rings are bonded through a single bond or a linking group; the aromatic rings may have an alkyl group; X represents -CO-, -S-, or -SO 2 -; Y is identical or different, and each represents -S-, -SO 2 -, -O-, -CO-, -COO-, or -CONH-; and n represents an integer of 0 or greater, provided that at least one of all Ar 1 to Ar 3 contained in L is a group in which two hydrogen atoms are removed from an aromatic ring structure having an alkyl group, and/or at least one of all Ar 1 to Ar 3 contained in L is a group in which two hydrogen atoms are removed from a structure in which two or more aromatic rings are bonded through a halogenated alkylene group, wherein a proportion of the group represented by Formula (r-1) to a sum of the group represented by Formula (r-1) and the group represented by Formula (r-2) is 97% or greater. where R 1 and R 2 are identical or different, and each represent a group represented by Formula (r-1) or a group represented by Formula (r-2): where Q represents C or CH, and two Q's in Formula (r-1) and Formula (r-2) bond to each other through a single bond or a double bond; R 3 to R 6 are identical or different, and each represent a hydrogen atom or a hydrocarbon group; R 3 and R 4 may bond to each other to form a ring; n' represents an integer of 0 or greater; and a bond with a wavy line is bonded to D 1 or D 2 , where D 1 and D 2 are identical or different, and each represent a single bond or a linking group; and L represents a divalent group having a repeating unit containing a structure represented by Formula (I) and a structure represented by Formula (II): where Ar 1 to Ar 3 are identical or different, and each represent a group in which two hydrogen atoms are removed from an aromatic ring structure or a group in which two hydrogen atoms are removed from a structure in which two or more aromatic rings are bonded through a single bond or a linking group; the aromatic rings may have an alkyl group; X represents -CO-, -S-, or -SO 2 -; Y is identical or different, and each represents -S-, -SO 2 -, -O-, -CO-, -COO-, or -CONH-; and n represents an integer of 0 or greater, provided that at least one of all Ar 1 to Ar 3 contained in L is a group in which two hydrogen atoms are removed from an aromatic ring structure having an alkyl group, and/or at least one of all Ar 1 to Ar 3 contained in L is a group in which two hydrogen atoms are removed from a structure in which two or more aromatic rings are bonded through a halogenated alkylene group, wherein a proportion of the group represented by Formula (r-1) to a sum of the group represented by Formula (r-1) and the group represented by Formula (r-2) is 97% or greater. <EOS>