To provide a rolling steel product correction machine having an openable shoulder in horizontal direction for changing a roll quickly.

There is provided a rolling steel product correction machine wherein a frame structure 11 has a pair of opposing shoulders 12, 13 for supporting two sets of rolls 14, 15, namely an upper set of rolls 14 and a bottom set of rolls 15, and a correction route for correcting the rolling steel product is constituted between the rolls. In this case, the opposed shoulders 12, 13 can be parallely moved in horizontal direction between a closed operative position where the rolls 14, 15 are supported in surrounded condition, and an open non- operative position where a set of the rolls 14, 15 can be removed so as to be exchanged with another set of different rolls. Further, a support carrying means, which is independent of the frame structure 11 and supports a set of rolls 14, 15 at an open non-operative position of the shoulders 12, 13 is installed.