A power storage device comprising: a plurality of battery unit receiving portions for receiving battery units, each battery unit receiving portion having a connector; and an attaching panel to which the plurality of connectors are attached in a floatable state in a plane intersecting a direction of insertion of the battery unit into the battery unit receiving portion and which is disposed on an end of the plurality of battery unit receiving portions; at least one connecting member that electrically connects the plurality of connectors with each other; characterized in that at least a portion, which is inserted into the respective connector, of the connecting member is a bus bar-like terminal; wherein each connector comprises a first housing that is attached to the attaching panel, a second housing that is attached to the first housing and forms a contact receiving portion jointly with the first housing, and a contact that is at least partially received in the contact receiving portion, wherein the second housing is attached to the first housing so as to be movable relative to the first housing in the plane intersecting the direction of insertion of the battery unit, wherein the contact is received in the contact receiving portion in a state where the contact is unfixed to the first housing and the contact is unfixed to the second housing, thereby the contact is movable relative to the first housing and the second housing; and wherein the contact comprises at least one first contact portion that is disposed on the first housing side for contact with the connecting member; wherein the at least one connecting member is connected at its one end to the contact of one of the plurality of connectors and at its other end to the contact of another one of the plurality of connectors. a plurality of battery unit receiving portions for receiving battery units, each battery unit receiving portion having a connector; and an attaching panel to which the plurality of connectors are attached in a floatable state in a plane intersecting a direction of insertion of the battery unit into the battery unit receiving portion and which is disposed on an end of the plurality of battery unit receiving portions; at least one connecting member that electrically connects the plurality of connectors with each other; at least a portion, which is inserted into the respective connector, of the connecting member is a bus bar-like terminal; wherein each connector comprises a first housing that is attached to the attaching panel, a second housing that is attached to the first housing and forms a contact receiving portion jointly with the first housing, and a contact that is at least partially received in the contact receiving portion, wherein the second housing is attached to the first housing so as to be movable relative to the first housing in the plane intersecting the direction of insertion of the battery unit, wherein the contact is received in the contact receiving portion in a state where the contact is unfixed to the first housing and the contact is unfixed to the second housing, thereby the contact is movable relative to the first housing and the second housing; and wherein the contact comprises at least one first contact portion that is disposed on the first housing side for contact with the connecting member; wherein the at least one connecting member is connected at its one end to the contact of one of the plurality of connectors and at its other end to the contact of another one of the plurality of connectors.