Manufacturing apparatus

A manufacturing apparatus comprising:

• a pair of pressure bonding rollers each having a cylindrical shape,
• wherein a first metal foil and a second metal foil stacked are inserted between the pair of rollers,
• wherein the first metal foil and the second metal foil are pressure bonded by a rotation of the pair of pressure bonding rollers,
• wherein the pair of pressure bonding rollers include a first pressure bonding roller provided on a side of the first metal foil and a second pressure bonding roller different from the first pressure bonding roller,
• wherein the first pressure bonding roller includes a D-cut surface at least in a portion of the cylindrical shape, and
• wherein a protrusion is provided in each of two boundaries between a side surface and the D-cut surface of the cylindrical shape in the first pressure bonding roller.