This equipment temperature adjusting apparatus comprises a working fluid circuit (10) and a fragmentation structure (20). The working fluid circuit constitutes a thermosiphon heat pipe. The working fluid circuit has an evaporator (12) that evaporates the working fluid using the heat absorbed from equipment (BP) and a condenser (14) that cools and condenses the working fluid evaporated by the evaporator. In the working fluid circuit, the working fluid moves between the evaporator and the condenser. The fragmentation structure is provided within the working fluid circuit. The fragmentation structure fragments the bubbles in the working fluid in liquid form.