A method for producing a catalyst composition for hydrogenation, wherein:: a titanocene compound represented by following general formula: wherein R 5 and R 6 each 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, and 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 may be the same or different; provided that R 1 and R 2 are not all hydrogens or all hydrocarbon groups 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; and: an unsaturated compound are used, wherein the is an unsaturated polymer having a fraction of an olefinic unsaturated double bond content of the side chains based on a total olefinic unsaturated double bond content of 0.25 to 1.0, or the is an unsaturated compound having a molecular weight of 400 or less and is selected from the group consisting of myrcene, isoprene, 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 wherein a mass ratio of the to the ( /) is set in a range of 0.1 to 8; and the method comprises: a force application step of applying a shearing force at a shearing rate of 1000 (1/s) or more to at least the; and a step of mixing the, the, and the.: a titanocene compound represented by following general formula: wherein R 5 and R 6 each 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, and 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 may be the same or different; provided that R 1 and R 2 are not all hydrogens or all hydrocarbon groups 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; and: an unsaturated compound are used, wherein the is an unsaturated polymer having a fraction of an olefinic unsaturated double bond content of the side chains based on a total olefinic unsaturated double bond content of 0.25 to 1.0, or the is an unsaturated compound having a molecular weight of 400 or less and is selected from the group consisting of myrcene, isoprene, 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 wherein a mass ratio of the to the ( /) is set in a range of 0.1 to 8; and the method comprises: a force application step of applying a shearing force at a shearing rate of 1000 (1/s) or more to at least the; and a step of mixing the, the, and the. a force application step of applying a shearing force at a shearing rate of 1000 (1/s) or more to at least the; and a step of mixing the, the, and the.