A forming method that forms a press component with an L shape from a blank metal sheet (S), the press component having a top sheet section and a vertical wall section which is connected to the top sheet section via a bent section having a part curved in an arc shape and which has a flange section on an opposite side to the bent section , the top sheet section being arranged at an outside of the arc of the vertical wall section , the method comprising: disposing the blank metal sheet (S) between a die and both of a pad and a bending die ; characterized by forming the vertical wall section and the flange section while an end portion of a part of the blank metal sheet (S) corresponding to a lower side of the L shape is caused to slide on a part of the die corresponding to the top sheet section by vertically and relatively moving the die and the bending die , the forming of the vertical wall section and the flange section being performed in a state where: as an out-of-plane deformation suppressing area, at least a part of the blank metal sheet (S) corresponding to the top sheet section is made close to or brought into contact with the pad so that a clearance between the pad and the die is equal to or larger than a thickness of the blank metal sheet (S) and is maintained to be equal to or smaller than 1.1 times the thickness of the blank metal sheet (S); and the end portion of the part of the blank metal sheet (S) corresponding to the lower side of the L shape is arranged on a same plane as that of the top sheet section . disposing the blank metal sheet (S) between a die and both of a pad and a bending die ; characterized by forming the vertical wall section and the flange section while an end portion of a part of the blank metal sheet (S) corresponding to a lower side of the L shape is caused to slide on a part of the die corresponding to the top sheet section by vertically and relatively moving the die and the bending die , the forming of the vertical wall section and the flange section being performed in a state where: as an out-of-plane deformation suppressing area, at least a part of the blank metal sheet (S) corresponding to the top sheet section is made close to or brought into contact with the pad so that a clearance between the pad and the die is equal to or larger than a thickness of the blank metal sheet (S) and is maintained to be equal to or smaller than 1.1 times the thickness of the blank metal sheet (S); and the end portion of the part of the blank metal sheet (S) corresponding to the lower side of the L shape is arranged on a same plane as that of the top sheet section . as an out-of-plane deformation suppressing area, at least a part of the blank metal sheet (S) corresponding to the top sheet section is made close to or brought into contact with the pad so that a clearance between the pad and the die is equal to or larger than a thickness of the blank metal sheet (S) and is maintained to be equal to or smaller than 1.1 times the thickness of the blank metal sheet (S); and the end portion of the part of the blank metal sheet (S) corresponding to the lower side of the L shape is arranged on a same plane as that of the top sheet section . <EOS>