Cooling apparatus boiling and condensing refrigerant with effective performance in a titled position

A cooling apparatus boiling and condensing refrigerant comprising:

• a refrigerant container to the bottom outside of which a heat-generating member is attached and within which a refrigerant that boils when it receives heat from the heat-generating member is stored,
• a heat radiating section having plural tubes communicating the inside of the refrigerant container and assembled almost erectly on the surface of the refrigerant container, and
• a header tank through which the plural tubes are communicated with each other;
• wherein the heat-generating member is cooled by the refrigerant stored in the refrigerant container, which is evaporated into vapor when receiving heat from the heat-generating member and radiates the latent heat of the refrigerant vapor from the heat radiating section;
• wherein a boiling area where the refrigerant is evaporated into vapor by the heat-generating member is formed within the refrigerant container;
• and
• wherein, on the floor within the refrigerant container, one or plural surrounded refrigerant channels surrounding the boiling area and plural substantially straight refrigerant channels extending from the substantially annular refrigerant channels to the boiling area, over substantially all around the circumference of the substantially annular refrigerant channels, are formed in the same plane.