A bus bar includes a first heat absorber that is joined to an output terminal of a first battery, a second heat absorber that is joined to an output terminal of a second battery, and a main body that electrically connects the first heat absorber to the second heat absorber. The first heat absorber and the second heat absorber have a heat capacity larger than a heat capacity of the main body. The main body has a first connecting part that is electrically connected to the first heat absorber, a second connecting part that is electrically connected to the second heat absorber, and a displacement absorber that is disposed between the first connecting part and the second connecting part and deforms in response to a relative displacement of the first battery and the second battery.