Connection structure, bus bar, and connector

A connection structure in which a first connection surface of a bus bar and a second connection surface of a connection object are connected to each other, the connection structure comprising:

• a potting member applied between the first connection surface and the second connection surface;
• and
• a bolt fastening the bus bar and the connection object together such that the first connection surface and the second connection surface are pressed against each other,
• wherein the bus bar includes a first base member made of aluminum, and a copper piece of plate shape that is joined to the first base member by metallic bonding and that forms the first connection surface,
• the connection object includes a second base member made of aluminum, and the second connection surface is formed of the second base member,
• the first connection surface has a projection projecting toward the second connection surface, and
• when the bus bar and the connection object are fastened together with the bolt, the projection makes contact with the second base member with the first connection surface and the second connection surface being covered by the potting member, so that the first base member and the second base member are electrically connected to each other.