An electrolyte membrane with a backsheet is sent out from an electrolyte membrane unwinding roller, and is separated with its second side sucked on a suction roller by a first press roller. While the electrolyte membrane from which the backsheet has been s...

A negative-electrode active material layer formed between a negative-electrode current collector (11) and a solid electrolyte layer (13) has a line-and-space structure in which a plurality of stripe-shaped pattern elements (121) extending in a Y direction ...