A composition comprising a first crosslinkable polymer compound comprising an aromatic conjugated repeating unit and a crosslinkable group and comprising at least one of a light emitting property and charge transportability, and a second crosslinkable polymer compound comprising an aromatic conjugated repeating unit and a crosslinkable group at least one of which is different from the aromatic conjugated repeating unit in the first crosslinkable polymer compound and the crosslinkable group in the first crosslinkable polymer compound, and comprising at least one of a light emitting property and charge transportability, wherein the crosslinkable group in each of the first crosslinkable polymer compound and the second crosslinkable polymer compound is a group represented by any of the following formulae (Z-1) to (Z-10), wherein at least one of the first crosslinkable polymer compound and the second crosslinkable polymer compound has a crosslinkable group represented by the formula (Z-3) or (Z-4): in the formulae (Z-1) to (Z-10), R c represents a hydrogen atom, an unsubstituted or substituted alkyl group, an unsubstituted or substituted alkoxy group, an unsubstituted or substituted alkylthio group, an unsubstituted or substituted aryl group, an unsubstituted or substituted aryloxy group, an unsubstituted or substituted arylthio group, an unsubstituted or substituted amino group, an unsubstituted or substituted silyl group, a halogen atom, an acyl group, an acyloxy group, an imine residue, a carbamoyl group, an acid imide group, a monovalent heterocyclic group, an unsubstituted or substituted carboxyl group, a cyano group or a nitro group; R N represents an unsubstituted or substituted alkyl group, an unsubstituted or substituted aryl group, an unsubstituted or substituted arylalkyl group, an unsubstituted or substituted acyl group or an unsubstituted or substituted monovalent heterocyclic group; the plurality of R c moieties may be the same or different; wherein the first crosslinkable polymer compound and the second crosslinkable polymer compound have a repeating unit represented by the following formula,, or: in the formula, R 1 and R 2 each independently represent an unsubstituted or substituted alkyl group, an unsubstituted or substituted alkoxy group, an unsubstituted or substituted aryl group, an unsubstituted or substituted aryloxy group, an unsubstituted or substituted arylalkyl group or an unsubstituted or substituted arylalkoxy group; a and b are each independently an integer of 0 to 3 and n is 1 or 2; Y is a group represented by the formula; when there are a plurality of R 1 moieties, a plurality of R 2 moieties or a plurality of Y moieties, each of them may be the same or different; in the formula, R 1 represents an unsubstituted or substituted alkyl group, an unsubstituted or substituted alkoxy group, an unsubstituted or substituted aryl group, an unsubstituted or substituted aryloxy group, an unsubstituted or substituted arylalkyl group or an unsubstituted or substituted arylalkoxy group; a is an integer of 0 to 3 and n is 1 or 2, a and n satisfying 1≤a+n≤4; Y has the same meaning as described above; when there are a plurality of R 1 moieties or a plurality of characters of n, each of them may be the same or different; in the formula, Q represents an oxygen atom, a sulfur atom, -N(R 3)-, -O-C(R 1)(R 2)- or -Si(R 1)(R 2)-; R 1, R 2, Y and n have the same meaning as described above; R 3 represents an unsubstituted or substituted alkyl group, an unsubstituted or substituted aryl group or an unsubstituted or substituted arylalkyl group; when there are a plurality of Y moieties, these may be the same or different; in the formula, R 1, R 2 and Y have the same meaning as described above; c and d each independently represent an integer of 0 to 4 and e represents 0 or 1; Ar 2 represents an arylene group or a divalent heterocyclic group; when there are a plurality of R 1 moieties, a plurality of R 2 moieties or a plurality of Y moieties, each of them may be the same or different; in the formula, J 1 and J 2 each independently represent an alkylene group and X 1 represents an oxygen atom, a nitrogen atom or a sulfur atom; i, j and 1 each independently represent 0 or 1 and k represents an integer of 1 to 3; when there are a plurality of J 1 moieties, a plurality of X 1 moieties, or a plurality of characters of i and a plurality of characters of j, each of them may be the same or different; Z represents a crosslinkable group represented by any of the formulae (Z-1) to (Z-10). a first crosslinkable polymer compound comprising an aromatic conjugated repeating unit and a crosslinkable group and comprising at least one of a light emitting property and charge transportability, and a second crosslinkable polymer compound comprising an aromatic conjugated repeating unit and a crosslinkable group at least one of which is different from the aromatic conjugated repeating unit in the first crosslinkable polymer compound and the crosslinkable group in the first crosslinkable polymer compound, and comprising at least one of a light emitting property and charge transportability,