Cooler

A cooler comprising:

• a cold plate to absorb heat from a heat source into coolant;
• a housing filled with the coolant and located on an upper side of the cold plate in a first direction;
• and
• a partition located on a lower side in the housing;
• wherein
• the housing includes:
• an inflow port through which the coolant flows into the housing;
• and
• an outflow port through which the coolant flows out of the housing;
• the inflow port and the outflow port are provided on one side in a second direction perpendicular or substantially perpendicular to the first direction;
• the cold plate includes a first plate chamber and a second plate chamber in which the coolant flows between the cold plate and the partition;
• the partition includes a first through hole communicating with the first plate chamber;
• the first plate chamber is farthest from the inflow port to another side in the second direction;
• and
• the housing includes a communication flow path allowing the inflow port to communicate with the first through-hole.