Endoscopes, radiating linear material

The present invention includes a tubular portion 20, and the heating element 40 in the tube portion 20 has a graphite thermal conductor 43 connected to the heating elements 40, the heat conductor 43, the graphite sheet or a laminate thereof, the graphite sheet has an area is not less 4 mm Further, the present invention provides a heat radiating linear material wound spirally such that a portion of the graphite sheet or laminate overlap each other, the thickness of the graphite sheet is 50nm ultra 9.6μm or less.