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In a pressure vessel where dry nitrogen had been substituted, styrene was polymerized at 60° C. in cyclohexane as a solvent in the presence of s-butyllithium as a polymerization initiator, and then TMEDA was added as a Lewis base. Then, isoprene and styrene were consecutively polymerized to give a styrene-isoprene-styrene block copolymer. The thus-obtained block copolymer was hydrogenated in cyclohexane in the presence of Pd/C as a catalyst under a 2 MPa hydrogen atmosphere, to give a hydrogenated block copolymer (the hydrogenated block copolymer obtained in Referential Example 2 will be abbreviated as “Copolymer No. 1” hereinafter). Table 3 shows a styrene content, a number average molecular weight, a vinyl bond content and a hydrogenation ratio of the obtained Copolymer No. 1.

1. customIn a pressure vessel where dry nitrogen had been substituted