A cooling apparatus which stably cools a target. The cooling apparatus includes a primary circuit that has a first heat exchanging section which is provided at a
heat exchanger, and vaporizes a liquid-phase primary
coolant to be a gas-phase primary
coolant, and a condenser which condenses the gas-phase primary
coolant to be the liquid-phase primary coolant, and lets the liquid-phase primary
coolant flow to the first heat exchanging section from the condenser through a liquid
piping and lets the gas-phase primary
coolant flow to the condenser from the first heat exchanging section through a gas
piping. The cooling apparatus further includes a
secondary circuit having a second heat exchanging section, an expansion valve, an
evaporator, and a compressor connected together by a coolant
piping.