Abstract: A battery pack includes: a plurality of assembled batteries disposed in a housing; respective acquisition devices that acquire battery information from the assembled battery corresponding thereto; and a monitor that wirelessly communicates with the respective acquisition devices. The monitor includes a main antenna, and the respective acquisition devices include respective sub-antennas. The respective assembled batteries include respective projections formed thereon, the respective projections including respective conductive connectors configured to electrically connect the battery cells to each other. Hereinafter, the direction in which the respective projections project s defined as a projection direction. The respective sub-antennas are disposed. in the housing, at least a part of the respective sub-antennas being positioned farther in the projection direction than a projection-direction end of the respective conductive connectors is.