A blank (30) that is a material for an elongated press formed article (20) having a substantially hat shaped lateral cross-section profile including a top plate section (20a), a ridge line section (20b), a flange section (20c), and vertical wall section (20d), and configured with a first portion (21) in which the top plate section has a substantially fixed width, and a second portion (22) including a curved portion (23) in which the top plate section (20a) exhibits an L-shape in plan view due to the vertical wall section (20c), the ridge line section (20b), and the flange section (20d) curving along with the width of the top plate section gradually increasing. The blank (30) has a shape of an opened-out shape of the press formed article (20), additionally with a first recess (33), a protrusion (34), and a second recess (35) provided to an edge of an excess portion (32) additionally provided at an edge of a location that will form the flange section (20d) configuring the curved portion (23).