Cooling member and power storage module provided with cooling member

A cooling member 20 is provided with: a refrigerant 21; an inclusion body 25 in which the refrigerant 21 is enclosed in a sealed state, with a first sheet part 26A and a second sheet part 26B placed facing opposite; absorbing members 22A-22C arranged inside the inclusion body 25, for absorbing the refrigerant 21; and spacers 30A-30D arranged inside the inclusion body 25, for holding a space between the first sheet part 26A and the second sheet part 26B.