(WO2020/203837) 1. A polymer compound in which a plurality of polymer chains are linked by a linking group having a valence of 2 or more, wherein the linking group having a valence of 2 or more has a thiol group and at least one of a thioether structure and a thiourethane structure, and a ratio of an absolute weight average molecular weight to a relative weight average molecular weight (absolute Mw /relative Mw) is 1.25 or more. 2. The polymer compound of claim 1, wherein the linking group having a valence of 2 or more includes at least one of structures represented by Formula (1) and (2).(In the formula (1), R1 and R2 are each independently a hydrogen atom, a 1-valent hydrocarbon group, a hydroxyl group, or a 1-valent electron-withdrawing group; R3 is an oxygen atom, a 2-valent hydrocarbon group, or a 2-valent electron-withdrawing group; X is an oxygen atom or a sulfur atom;-* is a bond;) 3. The polymer compound according to claim 1, wherein the linking group having a valence of 2 or more has 1 ~ 300 thiol groups per molecule of the polymer compound 1. 4. The polymer compound according to claim 1 ~ 3, wherein the absolute Mw /relative Mw is 3.00 or less. 5. A method for producing a polymer compound, comprising: reacting a polyfunctional thiol compound (A) with a compound (B) having a reactive group reactive with a thiol group to obtain a chain transfer agent (F) having a thiol group; and polymerizing a vinyl compound in the presence of the chain transfer agent (F) having a thiol group and a radical polymerization initiator to obtain a polymer compound. 6. The method for producing a polymer compound according to claim 5, wherein the reactive group reactive with the thiol group is 1 or more selected from the group consisting of an acrylate group, a glycidyl group, and an isocyanate group. 7. A composition comprising, as a main component, a compound (E) having a moiety derived from a polyfunctional thiol compound (A) and a moiety derived from a compound (B) having a reactive group reactive with a thiol group, wherein the composition satisfies formulas (11) and (12). r × (fA-1) × (fB-1) < 1.2... (11) r = (fB × y) / (fA × x)... (12) (Formula (11), fA is an average number of thiol groups per 1 molecule of the polyfunctional thiol compound (A), fB is an average number of reactive groups per 1 molecule of the compound (B), fA is 2.0 or more, fB is 1.2 or more, provided that only the compound (A) having the thiol group number of 2 and only the compound (B) having the reactive group number of 2 is excluded, r is a value calculated by the formula (12) when the molar ratio of the moiety derived from the polyfunctional thiol compound (A) to the moiety derived from the compound (B) is x: y. 8. The composition of claim 7, wherein the compound (E) is a compound having at least 1 thiol groups per 1 molecule. 9. fA + fB > 4.0. 10. The composition according to claim 7 ~ 9, wherein the reactive group reactive with the thiol group is 1 or more selected from the group consisting of an acrylate group, a glycidyl group, and an isocyanate group. 11. The composition of claim 7 ~ 10, wherein the composition is a chain transfer agent in a radical polymerization reaction system. 12. A method for producing a composition, in which a polyfunctional thiol compound (A) and a compound (B) having a reactive group reactive with a thiol group are reacted under conditions satisfying formulas (13) and (14). r'× (fA-1) × (fB-1) < 1.2... (13) r' = (fB × y') / (fA × x')... (14) (Formula (13), fA is an average number of thiol groups per 1 molecule of the polyfunctional thiol compound (A), and fB is an average number of reactive groups per 1 molecule of the compound (B). fA is 2.0 or more and fB is 1.2 or more, with the proviso that only a compound (A) having a thiol group number of 2 and only a compound (B) having a reactive group number of 2 is excluded; r'is a value calculated by the formula (14) when the molar ratio of the polyfunctional thiol compound (A) to the compound (B) is x': y'. 13. fA + fB > 4.0. 14. The method for producing the composition according to claim 12, wherein the polyfunctional thiol compound (A) and a compound (B) having a reactive group reactive with the thiol group are reacted in the presence of a catalyst (C). 15. Wherein the amount of the solvent at the start of the reaction between the polyfunctional thiol compound (A) and the compound (B) having a reactive group reactive with the thiol group is 50 mass% Or less, and an external temperature during the reaction between the polyfunctional thiol compound (A) and the compound (B) having a reactive group reactive with the thiol group is 10 ~ 50 °C. 16. A resin composition comprising: the polymer compound according to claim 1 ~ 4; and a thermoplastic resin. 17. The resin composition according to claim 16, wherein the mass ratio of the polymer compound or the composition to the thermoplastic resin is (the polymer compound or the composition) /thermoplastic resin = 0.1/99.9 ~ 95/5. 18. An additive for lubricating oil comprising the polymer compound according to claim 1 ~ 4. 19. The additive for lubricating oil according to claim 18, wherein the relative Mw of the polymer compound is 15000 or more and 45000 or less. 20. A lubricating oil comprising the additive for lubricating oil according to claim 18.
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