Power Storage Device

A power storage device includes: a power storage stack including a first cell group, a second cell group, and a middle plate; a lower case having a bottom wall portion; a first heat conduction member disposed between the first cell group and the bottom wall portion; and a second heat conduction member disposed between the second cell group and the bottom wall portion. The lower case includes a pedestal portion supporting the middle plate, and the first heat conduction member and the second heat conduction member are provided to contact the pedestal portion.