Heat conducting sheet and a production method thereof

Thermally conductive sheet comprises a laminated sheet, the first laminated sheet and the first and which are bonded respectively to the second main surface and a second insulating sheet. Laminated sheet has a plurality of graphite sheets, and one or more being arranged in a plurality of graphite sheets and alternately laminating a plurality of graphite sheets of the adhesive layer. The first and the second insulation sheet seals the laminated sheet by being bonded to each other outside the outer peripheral edge of the laminated sheet. Laminated sheet has an outer peripheral portion connected to the outer peripheral edge, and a inland away from the outer peripheral end. The thickness of the outer peripheral portion of the laminated sheet is thinner than the thickness of the interior. The thermally conductive sheet excellent in reliability of sealing by the insulation sheet.