Endoscope cooling apparatus

An endoscope apparatus having a scope part including an end part, a shaft part, and an operation part to be held, and an external device, the scope part comprising:

• a heat exchanger provided in the end part having a flow passage for a cooling liquid for cooling a functional element that generates heat;
• a first tube having a first end connected to a first end of the flow passage of the heat exchanger, and extending toward the shaft part;
• a second tube having a first end connected to a second end of the flow passage of the heat exchanger, and extending toward the shaft part;
• and
• a displacement-to-flow converting part connected to a second end of the first tube and a second end of the second tube to convert a displacement of a predetermined part to a flow of the cooling liquid,
• wherein a displacement generating part is provided in the external device to generate a displacement, and
• wherein the predetermined part of the displacement-to-flow converting part and the displacement generating part are connected by a displacement transmission part.