The invention provides a rolling shape control system which prevents occurrence of situation which causes the abnormal rolling work, and can roll more steadily. The rolling shape control system (21) is used for a rolling apparatus (1) which coils the rolled material (4) extracted from an input side tension coiling machine (3) to an output side tension coiling machine (6) after the roller material(4) is rolled by a rolling machine (2); on the basis of a target shape (33) formed by a target shape generation device, the shape of the roller material is controlled. Moreover, the rolling shape control system (21) includes a plate thickness change width direction ratio obtaining device (22) and a target shape change device (23), the plate thickness change width direction ratio obtaining device obtains a plate thickness change width direction ratio (24), which is the ratio of the plate thickness change resulted from rolling of the roller material in the width direction of the roller material, the target shape change device changes the target shape according to the plate thickness change width direction.