COOLING LIQUID COMPOSITION FOR FUEL CELL

A coolant composition for a fuel cell unit, which contains at least one aliphatic alcohol having unsaturated bonds in the molecules having 2 to 20 carbon atoms each. The coolant composition maintains the electrical conductivity of the coolant at 10 µS/cm or below as well as the fluctuation of the electrical conductivity within the range of 0 to 10 µS/cm.