Adhesive sheet, cured foam and electric motor

An adhesive sheet comprising;

• a substrate;
• a first adhesive layer disposed on one surface of the substrate and
• a second adhesive layer disposed on the other surface of the substrate, wherein
• the first adhesive layer includes an adhesive (A), a thermally conductive filler (B) having a mean short side length of 1 μm or more, and a foaming agent (C),
• the content of the thermally conductive filler (B) is 1% by volume or more and 37% by volume or less based on the total volume of the first adhesive layer,
• the thermally conductive filler (B) includes a filler (B-1) having an aspect ratio of 1.3 or more,
• the second adhesive layer includes an adhesive (A′), a thermally conductive filler (B′) having a mean short side length of 1 μm or more, and a foaming agent (C′),
• the content of the thermally conductive filler (B′) is 1% by volume or more and 37% by volume or less based on the total volume of the second adhesive layer, and
• the thermally conductive filler (B′) includes a filler (B′-1) having an aspect ratio of 1.3 or more.