Method for cooling electronic components and thermally conductive sheet for use therewith

A thermally conductive sheet 15 includes a thermally conductive layer 18 and an insulation layer 17 laminated onto the thermally conductive layer 18. The thermally conductive layer 18 includes matrix containing thermally conductive filler having an electrical conductivity. The insulation layer 17 contains thermally conductive filler having an insulating property. The thermally conductive sheet 15 is disposed so that the insulation layer 17 covers the terminal 13 of the electronic component 12 and the electric circuit 14. At this time, the thermally conductive layer 18 covers and closely contacts with the insulation layer 17 and the electronic component 12. The heat generated by the electronic component 12 is conducted to a cooling member 19 through the thermally conductive layer 18 and is ultimately dissipated.