1. A circuit assembly comprising:a heatsink;
an insulating sheet disposed on the heatsink; and
a circuit board spaced apart from the heat sink, wherein the insulating sheet is disposed between the circuit board and the heat sink,
wherein the circuit board is fixed to the heatsink by a fixing member, and
a plurality of heat conductive members formed of viscous material and is disposed on the insulating sheet so as to be pressed between the insulating sheet and the circuit board and form a continuous planar surface, each of the plurality of heat conductive members being spaced a part from each other so as to form a gap.