To efficiently manufacture a seamless steel pipe whose finishing dimension is secured thanks to the continuously manufacturing line since deflected wall thickness in the circumferential direction is less and the thickness in the end of the pipe is inhibited.

(1) A method for controlling the metal rolling used in the seamless steel pipe manufacturing line connected in series by a boring machine, a drawing roll mill and an outside dia. forming mill and a hot thickness gage to measure a wall thickness dimension after the rolling in the outlet side of the drawing roll mill, and a hot thickness gage to measure a wall thickness dimension after the finishing in the outlet side of the outside dia. forming mill are provided and the method for controlling the metal rolling characterized by the feature that the finishing dimension after the outside forming mill is adjusted to meet the targeted dimension. (2) In the method for controlling the metal rolling described in (1), a hot thickness gage to measure wall thickness dimensions after boring in the outlet side of the boring machine is preferably provided.