Endoscope fogging prevention heater unit and endoscope

An endoscope fogging prevention heater apparatus which is provided inside of a distal end portion of an endoscope insertion portion and which prevents fogging which occurs in an optical member provided on the inside, the endoscope fogging prevention heater apparatus comprising:

• a heater which heats the inside to prevent the fogging;
• a temperature measurement sensor which measures the temperature of the inside;
• a wiring substrate on which the heater and the temperature measurement sensor are mounted in common;
• and
• an insulator which seals a mounting surface of the heater mounted on the wiring substrate, which seals the heater so that a surface of the heater opposite to the mounting surface is exposed and which entirely seals the temperature measurement sensor;
• and
• a conductive element provided inside the distal end portion of the endoscope insertion portion, the conductive element forming a space in optical communication with the optical member inside the distal end portion;
• wherein the surface of the heater is free of the insulator such that the surface is at least indirectly in contact with the conductive element so as to conduct heat from the heater to the conductive element;
• and
• the surface of the heater is fixed to the conductive element by an adhesive.