Holding device

A holding device comprising:

• a plate-shaped base member formed from a ceramic sintered body and having an upper face on which an object is to be held, a lower face disposed opposite to the upper face, and an outer edge, the plate-shaped base member defining a hole opening at the lower face, the hole extending toward the outer edge, and, when the hole is projected from the upper face toward the lower face, the hole includes a first guide section extending in a first direction, an intermediate guide section continuous with the first guide section, and a second guide section connected to the first guide section through the intermediate guide section, the second guide section extending to a far end section of the hole in a second direction different from the first direction, and
• a sheathed thermocouple including a thermocouple contained in a sheath, the sheathed thermocouple disposed in the hole with an end portion of the sheathed thermocouple in contact with the far end section of the hole and an intermediate portion of the sheathed thermocouple disposed closer to the opening of the hole than the far end section of the hole, the intermediate portion having an outer surface in contact with an inner wall surface of the intermediate guide section of the hole.