Laminated sheet

A laminated sheet comprising:

• a first porous layer including a plurality of fibers of at least one of inorganic fiber or carbonized fiber;
• and
• a second porous layer formed of a plurality of organic fibers,
• wherein the second porous layer includes a plurality of non-woven fabric layers that are peelable and arranged continuously in a predetermined in-plane direction between two principal surfaces facing each other,
• wherein each of the plurality of non-woven fabric layers is constituted with a plurality of organic fibers interknitted together as viewed in the predetermined in-plane direction,
• wherein the laminated sheet has a surface density of greater than or equal to 400 g/m2 and less than or equal to 1550 g/m2,
• wherein the second porous layer is formed of the plurality of organic fibers having a mean diameter of fibers being greater than or equal to 0.5 μm and less than or equal to 14 μm, and
• wherein, expressing a total volume of solids and voids filling a unit volume of the second porous layer as 100%, a percentage of the solids is greater than or equal to 1.0% and less than or equal to 8.0%.