An electricity storage device includes: a plurality of batteries juxtaposed in a first direction, each battery having on a first side a gas discharge valve that discharges a gas produced inside the battery; and a cooling path formed between the plurality of batteries that face each other in the first direction, constructed to convey a coolant that cools the batteries, and an intake opening for taking in the coolant on a second side that is an opposite side to the first side in a second direction orthogonal to the first direction and a discharge opening for discharging the coolant taken in on at least one of sides in a third direction orthogonal to the second direction and to the first direction.