Heating device, fixing device, image forming apparatus, laminator, and thermocompression device

A heating device comprising:

• an endless belt configured to rotate in a first direction;
• a heater including a heat generator to heat the endless belt;
• a temperature detector to detect a temperature of the heater;
• a high thermal conductor contacting the heater, the high thermal conductor including a hole or a notch in which the temperature detector is disposed;
• a holder including a housing portion to hold the heater and the high thermal conductor and restrict a movement of the high thermal conductor in at least downstream of the first direction;
• a first gap formed between an upstream surface in the first direction of the temperature detector and an upstream surface in the first direction of the hole or the notch of the high thermal conductor;
• a second gap formed between a downstream surface in the first direction of the high thermal conductor and a downstream surface in the first direction of the housing portion;
• wherein a size A of the first gap and a size B of the second gap satisfy a relationship of A>B.