Power Storage Device

A power storage device includes a lower case having a bottom portion including an inner surface and an outer surface, one or more power storage modules thermally connected to the inner surface of the bottom portion, and a cooler that is provided on a side of the outer surface of the bottom portion and cools the one or more power storage modules via the bottom portion. The cooler is made of a member having a rigidity lower than that of the lower case. The cooler includes a force exerting portion that exerts a force toward the bottom portion.