Tenshu of two-tier to five-tier structures in appearance were seen in large numbers and, at the end of the Azuchi-Momoyama period, many were constructed at Honmaru (the most important castle enclosure) deemed to be the final protective stronghold.
外観で2重から5重のものがよく見られ、安土桃山時代の末には最終防衛拠点としての位置づけがされており、本丸に築くことが多かった。