In accordance with the present invention, the plate thickness or more 100 mm, by the aperture value by pulling the plate thickness direction at the center of plate thickness is 40% or more, even in a high-strength steel plate having a thickness meat it may be necessary to increase the content of alloying elements without an increase in the size of the equipment, it is possible to obtain a thick high tensile steel having excellent strength and toughness of the center part of plate thickness.