Abstract: In an expanded mesh of this invention, a latitude skeletal element composing a mesh has a length which is substantially not elongated from a state of a sheet-shaped material. For this reason, the expanded mesh is not bulged like a barrel. Namely, it is flat. Since a longitudinal skeletal element is inclined acutely relative to straight portions as compared with a conventional expanded mesh, the expanded mesh will become a grid with good current collecting efficiency when a lug of current collector plate is formed on an inclining direction side.