A catalyst composition for hydrogenation, comprising,,, and shown below, wherein a mass ratio of the to the ( /) is in a range of 0.1 to 4.0, and wherein a mass ratio of the to the ( /) is in a range of 0.01 to 1.00,: a titanocene compound represented by following general formula, wherein R 5 and R 6 represent a group selected from the group consisting of hydrogen, a hydrocarbon group having 1 to 12 carbon atoms, an aryloxy group, an alkoxy group, a halogen group, and a carbonyl group, R 5 and R 6 may be the same or different; and R 1 and R 2 represent a group selected from the group consisting of hydrogen and a hydrocarbon group having 1 to 12 carbon atoms, and R 1 and R 2 may be the same or different; provided that R 1 and R 2 are not all hydrogen atoms or all a hydrocarbon group having 1 to 12 carbon atoms,: a compound selected from the group consisting of organic lithium compounds, organic sodium compounds, organic potassium compounds, organic zinc compounds, organic magnesium compounds, organic aluminum compounds, organic calcium compounds, alkali (earth) metal hydrides, hydrides containing two or more kinds of metal selected from Li, Na, K, Mg, Zn, Al, and Ca, complexes synthesized by reacting in advance an organic alkali metal compound described above with an organic aluminum compound, and complexes (ate complexes) synthesized by reacting in advance an organic alkali metal compound described above with an organic magnesium compound, wherein said compound has the ability of reducing the titanocene compound,: an unsaturated compound having a molecular weight of 400 or less and is selected from the group consisting of myrcene, isoprene, octene, 1,7-octadiene and a polymer produced by polymerizing a monomer selected from conjugated dienes that have a hydrocarbon having 4 to 12 carbon atoms, monoterpene, vinyl aromatic compounds, norbornadiene, cyclopentadiene, cyclohexadiene, 2,3-dihydrodicyclopentadiene or acetylenes, and: a polar compound selected from the group consisting of alcohol compounds, ether compounds, thioether compounds, ketone compounds, sulfoxide compounds, carboxylic acid compounds, carboxylate compounds, aldehyde compounds, lactam compounds, lactone compounds, amine compounds, amide compounds, nitrile compounds, epoxy oxime compounds, and oxime compounds.: a titanocene compound represented by following general formula, wherein R 5 and R 6 represent a group selected from the group consisting of hydrogen, a hydrocarbon group having 1 to 12 carbon atoms, an aryloxy group, an alkoxy group, a halogen group, and a carbonyl group, R 5 and R 6 may be the same or different; and R 1 and R 2 represent a group selected from the group consisting of hydrogen and a hydrocarbon group having 1 to 12 carbon atoms, and R 1 and R 2 may be the same or different; provided that R 1 and R 2 are not all hydrogen atoms or all a hydrocarbon group having 1 to 12 carbon atoms,: a compound selected from the group consisting of organic lithium compounds, organic sodium compounds, organic potassium compounds, organic zinc compounds, organic magnesium compounds, organic aluminum compounds, organic calcium compounds, alkali (earth) metal hydrides, hydrides containing two or more kinds of metal selected from Li, Na, K, Mg, Zn, Al, and Ca, complexes synthesized by reacting in advance an organic alkali metal compound described above with an organic aluminum compound, and complexes (ate complexes) synthesized by reacting in advance an organic alkali metal compound described above with an organic magnesium compound, wherein said compound has the ability of reducing the titanocene compound,: an unsaturated compound having a molecular weight of 400 or less and is selected from the group consisting of myrcene, isoprene, octene, 1,7-octadiene and a polymer produced by polymerizing a monomer selected from conjugated dienes that have a hydrocarbon having 4 to 12 carbon atoms, monoterpene, vinyl aromatic compounds, norbornadiene, cyclopentadiene, cyclohexadiene, 2,3-dihydrodicyclopentadiene or acetylenes, and: a polar compound selected from the group consisting of alcohol compounds, ether compounds, thioether compounds, ketone compounds, sulfoxide compounds, carboxylic acid compounds, carboxylate compounds, aldehyde compounds, lactam compounds, lactone compounds, amine compounds, amide compounds, nitrile compounds, epoxy oxime compounds, and oxime compounds.