A urethane bumper spring having a hollow cylindrical shape produced by mold forming in a forming mold comprising: a skin layer being a portion within 2 mm from a molded body surface in a thickness direction as an outer layer; and a core portion inside the skin layer, wherein the urethane bumper spring is produced from a urethane raw material containing a polyester-based polyol formed of a condensation polymer of ethylene glycol, butanediol, and adipic acid as a polyol component and diphenylmethane diisocyanate as an isocyanate component, and having an NCO index of from 0.9 to 1.3, wherein the urethane raw material is heated in the forming mold at a temperature of from 70°C to 130°C for from 2 minutes to 60 minutes to be foamed and cured into polyurethane foam to obtain a urethane molded body, and after removing from the forming mold, the urethane molded body is heated at a temperature of from 100°C to 150°C for from 3 hours to 20 hours, wherein the skin layer has a density (Da) and a foamed cell diameter (Ra), and the core portion has a density (Db) and a foamed cell diameter (Rb), the density (Da), the foamed cell diameter (Ra), the density (Db), and the foamed cell diameter (Rb) satisfying relationships shown in the following expressions to, 1.0 ≤ Da / Db < 1.34 0.53 < Ra / Rb ≤ 1.0 25 μ ⁢ m ≤ Ra ≤ 400 μm 25 μ ⁢ m ≤ Rb ≤ 400 μm wherein the foamed cell diameter (Ra) and the foamed cell diameter (Rb) are measured on the basis of cross-sectional photographs taken with an electron microscope and a 10-point average of the diameters of the foamed cells of the skin layer and the core portion, respectively, and wherein the urethane bumper spring is configured to be fitted onto a piston rod of a shock absorber of a vehicle so as to elastically restrain an operation stroke of the shock absorber. a skin layer being a portion within 2 mm from a molded body surface in a thickness direction as an outer layer; and a core portion inside the skin layer, wherein the urethane bumper spring is produced from a urethane raw material containing a polyester-based polyol formed of a condensation polymer of ethylene glycol, butanediol, and adipic acid as a polyol component and diphenylmethane diisocyanate as an isocyanate component, and having an NCO index of from 0.9 to 1.3, wherein the urethane raw material is heated in the forming mold at a temperature of from 70°C to 130°C for from 2 minutes to 60 minutes to be foamed and cured into polyurethane foam to obtain a urethane molded body, and after removing from the forming mold, the urethane molded body is heated at a temperature of from 100°C to 150°C for from 3 hours to 20 hours, wherein the skin layer has a density (Da) and a foamed cell diameter (Ra), and the core portion has a density (Db) and a foamed cell diameter (Rb), the density (Da), the foamed cell diameter (Ra), the density (Db), and the foamed cell diameter (Rb) satisfying relationships shown in the following expressions to, 1.0 ≤ Da / Db < 1.34 0.53 < Ra / Rb ≤ 1.0 25 μ ⁢ m ≤ Ra ≤ 400 μm 25 μ ⁢ m ≤ Rb ≤ 400 μm wherein the foamed cell diameter (Ra) and the foamed cell diameter (Rb) are measured on the basis of cross-sectional photographs taken with an electron microscope and a 10-point average of the diameters of the foamed cells of the skin layer and the core portion, respectively, and wherein the urethane bumper spring is configured to be fitted onto a piston rod of a shock absorber of a vehicle so as to elastically restrain an operation stroke of the shock absorber.