Now you have the device for introducing the steel sheet in a continuous line is provided on the steel sheet and the hot dip coating of continuous lines in the same cold-rolled steel sheet. The opener device for steel continuous line, the cradle roll and features a steel tip end detection and escape detection sensor provided on the pivot arm is installed between the pinch rolls on the moving base to be movable up and down and back and forth on the path center side movement of installed coil steel coil steel steel plate front end portion corresponding to the diameter of the sensing portion; And, wherein the steel sheet conveyer leading end installed ever sensing unit rotational drive to the moving plate installed ever sides turning motion to the belt and, including the electromagnet means is disposed inside of the conveyor belt is configured to include a steel plate front end portion guiding portion for inducing the plate leading end . This invention in accordance, it is possible to smoothly automatically guided Sikkim, as well as precisely detect the departure state of the steel plate front end portion the front end of the steel plate in order to put the coiled steel sheet to a continuous line of a steel sheet such as hot dip coating of a steel plate front end portion sikieo it prevents the occurrence of problems such as steel twists or crashed due to the departure of the openers equipment to obtain an improvement that allows smooth progress than a continuous line of steel sheet commitments. Steel, Steel continuous process, bottle opener, steel induced distal end, the distal end steel sensor