GAS-LIQUID SEPARATION STRUCTURE

A gas-liquid separation structure that is mounted on a vehicle and is for separating gas from a coolant while circulating the coolant for cooling a target element of the vehicle, the structure including a branch joint for receiving inflow of the coolant returning from the target element and discharging the inflowed coolant in a branched manner to the target element and other element, in which the branch joint includes a body having an internal space elongated in a vertical direction, and a first inflow part penetratingly provided in the body so as to have a first opening that opens into the internal space, the first inflow part allowing the coolant returning from the target element to flow into the internal space from the first opening.