Cooling jacket, cooling unit, and electronic apparatus

A cooling unit comprising:

• a cooling jacket comprising:
• a flow channel member through which a cooling medium flows, at least a part of which is in contact with an object to be cooled, and which includes a region having a channel cross-sectional area larger than that of any other region, and
• a projection portion which is provided at a downstream side of the region where the channel cross-sectional area is large;
• a radiator which radiates heat received by the cooling media from the cooling jacket;
• and
• a pomp which circulates the cooling medium between the cooling jacket and the radiator.

An electronic apparatus comprising:

• a cooling unit comprising:
• a cooling jacket comprising:
• a flow channel member through which a cooling medium flows, at least a part of which is in contact with an object to be cooled, and which includes a region having a channel cross-sectional area larger than that of any other region, and
• a projection portion which is provided at a downstream side of the region where the channel cross-sectional area is large;
• a radiator which radiates heat received by the cooling media from the cooling jacket;
• and
• a pomp which circulates the cooling medium between the cooling jacket and the radiator;
• and
• the object.