A hydrogenated syndiotactic crystalline dicyclopentadiene ring-opening polymer obtained by hydrogenating 98 % or more of carbon-carbon double bonds of the dicyclopentadiene ring-opening polymer comprising a repeating unit derived from dicyclopentadiene in a ratio of 90 wt% or more relative to all repeating units, wherein the dicyclopentadiene comprises either the endo stereoisomer at a ratio of 90% or more or the exo stereoisomer at a ratio of 90% or more, and wherein the hydrogenated syndiotactic crystalline dicyclopentadiene ring-opening polymer has - a melting point of lower than 280°C and an initial melting temperature of 260°C or higher, as determined by heating at 320°C for 10 minutes, then cooling at 10°C/minute to room temperature to crystallize, and then measuring using a differential scanning calorimetry whilst heating at 10°C/minute, where the melting point is defined as the temperature at which the endothermic heat flow is a maximum at an endothermic peak due to phase transition observed in the measurement with rising temperature, and the initial melting temperature is defined by an intersection of a tangent before the endothermic heat flow of the endothermic peak due to the phase transition is maximum and a baseline, - and a syndiotacticity of higher than 90%, as determined by substituting a peak area value of the signal derived from the meso diad at 43.35 ppm and a peak area value of the signal derived from the racemo diad at 43.43 ppm into the following Formula I in the 13 C-NMR spectrum measured at 200°C in a o-dichlorobenzene-d 4 /trichlorobenzene mixed solvent. racemo diad / meso diad + racemo diad × 100 %. wherein the dicyclopentadiene comprises either the endo stereoisomer at a ratio of 90% or more or the exo stereoisomer at a ratio of 90% or more, and wherein the hydrogenated syndiotactic crystalline dicyclopentadiene ring-opening polymer has - a melting point of lower than 280°C and an initial melting temperature of 260°C or higher, as determined by heating at 320°C for 10 minutes, then cooling at 10°C/minute to room temperature to crystallize, and then measuring using a differential scanning calorimetry whilst heating at 10°C/minute, where the melting point is defined as the temperature at which the endothermic heat flow is a maximum at an endothermic peak due to phase transition observed in the measurement with rising temperature, and the initial melting temperature is defined by an intersection of a tangent before the endothermic heat flow of the endothermic peak due to the phase transition is maximum and a baseline, - and a syndiotacticity of higher than 90%, as determined by substituting a peak area value of the signal derived from the meso diad at 43.35 ppm and a peak area value of the signal derived from the racemo diad at 43.43 ppm into the following Formula I in the 13 C-NMR spectrum measured at 200°C in a o-dichlorobenzene-d 4 /trichlorobenzene mixed solvent. racemo diad / meso diad + racemo diad × 100 %. - a melting point of lower than 280°C and an initial melting temperature of 260°C or higher, as determined by heating at 320°C for 10 minutes, then cooling at 10°C/minute to room temperature to crystallize, and then measuring using a differential scanning calorimetry whilst heating at 10°C/minute, where the melting point is defined as the temperature at which the endothermic heat flow is a maximum at an endothermic peak due to phase transition observed in the measurement with rising temperature, and the initial melting temperature is defined by an intersection of a tangent before the endothermic heat flow of the endothermic peak due to the phase transition is maximum and a baseline, - and a syndiotacticity of higher than 90%, as determined by substituting a peak area value of the signal derived from the meso diad at 43.35 ppm and a peak area value of the signal derived from the racemo diad at 43.43 ppm into the following Formula I in the 13 C-NMR spectrum measured at 200°C in a o-dichlorobenzene-d 4 /trichlorobenzene mixed solvent. racemo diad / meso diad + racemo diad × 100 %.