Over the years in the Edo period, the examples of an Ichidai-garo officer being appointed increased little by little, and in contrast to these Ichidai-garo officers, the Karo officers from families that had produced a Karo officer for generations were called Eidai-garo (permanent Karo).
江戸時代も年代が経つにつれて、一代家老が登用される例が微増して行き一代家老に対して、家老連綿の家柄である門閥出身の家老を、永代家老と呼んだ。