To materilize tabilized tension control even when abnormality in actual tension is produced while executing tension control with using the actual tension from a tension-meter.

In the tension control method of a looper equipment for continuously operating a steel sheet production line, the actual tension control with using an actual tension 16 by a tension-meter 6 and the estimated tension control with using an estimated tension 18 based on a detected electric current of a looper driving motor 3 by a detector 9 are respectively executed, the actual tension control is executed in normal time, when abnormality of actual tension is detected, particles α, β are adjusted by a correcting gain controller 20, the weighted variable control, which gradually shifts from actual tension control to estimated tension control, is executed.