To provide a partially hydrogenated block copolymer capable of imparting excellent physical properties respectively, when made into a pressure-sensitive composition, a modified asphalt composition, a binder composition for pavement, etc.SOLUTION: A partially hydrogenated block copolymer includes: a polymer block (A) having a vinyl aromatic monomer unit as a main constituent; and a polymer block (B) containing a conjugated diene monomer unit. In a differential molecular weight distribution (B) of a degradation product of the partially hydrogenated block copolymer obtained by an ozone degradation method, if a maximum peak height in a region of the molecular weight 800-3000 is a hydrogenation rate distribution H, the H is 0.01-0.5.SELECTED DRAWING: None
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