A sheet-member stacked structure produced by a method including one or more of the following steps: stacking lead frames on each other, and stacking sheet members of one lead frame on sheet members of another or other lead frame or frames, each lead frame including a frame portion, the sheet members, and bridge portions which connect sides of the sheet members; to an inner peripheral portion of the frame portion and one of its adjacent sheet member, or to respective one sides of its two adjacent sheet members; stacking sheet members on each other via an adhesive; and stacking sheet members on each other, the sheet members including a liquid-chamber sheet member formed of a rolled metal sheet and having liquid chambers arranged, separately from each other, in a direction perpendicular to a direction of rolling of the metal sheet.