An endoscope fogging prevention unit includes: a distal end section including a cylindrical member, in an interior of which at least an optical member is provided a heating section configured to heat at least the optical member and a measuring section configured to measure a temperature of the interior of the distal end section. The fogging prevention unit further includes: a wiring substrate section including a mounting area portion and a wiring area portion and a conducting section having the lowest insulating properties against the outside in the mounting area portion, and connected to a ground of a system different from a system of a wiring member of the heating section and the measuring section.
