Length-Adjustable Inter-Bus Bar

An inter-bus bar including a first bus bar including a first body region having a fastening hole formed at one end and a first length adjusting region configured to extend by a predetermined length from the other end, and a second bus bar including a second body region having a fastening hole formed at one end and a second length adjusting region configured to extend by a predetermined length from the other end, the second bus bar being configured to be coupled to or released from the first bus bar, the first length adjusting region and the second length adjusting region forming a connection portion where they are at least partially overlapped, and the first length adjusting region and the second length adjusting region being removably coupled to each other at different relative positions to change the length of the connection portion.