To provide a method of surely manufacturing hot-rolled steel strips having width ( refer to the target width) in which edge seam marks are included in the part of surplus width in hot-rolling equipment on which a sizing press for performing width press of a steel slab with a pair of press dies having a projected part is installed.

The correlative relationship between the amount of deviation in the thickness direction of a slab hammering position and the amount of the maximum turn-around of the edge seam marks is previously determined for every slab standard including the kind of steel and dimensions of the slab. About that slab, the increment of the amount of the maximum turn-around of the edge seam marks is determined in the case where the amount of the deviation in the thickness direction at the slab hammering position is zero on the basis of the correlative relationship between the amount of the deviation in the thickness direction at the slab hammering position and the amount of the maximum turn-around of the edge seam marks. About the succeeding slab to which width press is applied after that slab, a set surplus width is corrected by adding the increment to the surplus width which is set in the case where the amount of the deviation in the thickness direction at the slab hammering position is zero.

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