Polymer containing sulfo group and organic electroluminescent element containing the polymer

A sulfo group-containing polymer compound having a structure formed by introducing sulfo groups into a polymer compound comprising repeating units represented by the general formula (1),

• wherein, in the formula, Ar1 and Ar2 each represents a monovalent aromatic group;
• Y represents a divalent group comprising an aromatic group;
• W represents a divalent aromatic group having 4 to 30 carbon atoms;
• a group represented by Y is a group represented by the general formula (a), and a group represented by W is a group represented by general formula (b-8),
• Y:
• wherein, in the formula, -Q- is a group selected from the group consisting of a single bond, —O—, —S—, —CH2—, —CMe2-, —CO—, —SO—, —SO2—, —SiH2— and —SiMe2-;
• and m represents an integer of 0 to 2,
• wherein, in the formula (b-8), Z1 to Z4 each represents a substituent;
• p1 and p2 each represents an integer of 0 to 5;
• p3 and p4 each represents an integer of 0 to 4, and wherein at least one of repeating units in which Ar1, Ar2, Y and at least one of four benzene rings bonded to a thiophene ring are substituted with a sulfo group in a polymer chain, in the repeating unit represented by the general formula (2),
• wherein, in the formula, Ar1, Ar2 and Y are the same as the general formula (1);
• Z1 to Z4 each represents a substituent;
• p1 and p2 each represents an integer of 0 to 5;
• p3 and h4 each represents an integer of 0 to 4.