A melted and resolidified layer which has a depth of at least 1 mm, and which is obtained by adding, melting, and resolidifying at least one [beta]-phase-stabilizing element is provided to the surface to be rolled of a titanium slab comprising industrial pure titanium produced using an electron beam melting method or a plasma arc melting method. The average concentration of the [beta]-phase-stabilizing element in a range up to a depth of 1 mm is at least 0.08 mass% but not more than 1.50 mass% higher than the concentration of the [beta]-phase-stabilizing element in the parent material. Powder, chippings, wire, and foil are used as raw materials which include the [beta]-phase-stabilizing element. Furthermore, electron beam heating and plasma arc heating are used as means for melting the surface layer.