This floor looks like an attic enclosed with the second layer of the roof. There is no window, but only one fanlight. You might never notice this room from the outside.
<aside> 💡 関連記事：天守形式
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This is the lord’s chamber.
In case of an emergency, the headquarter would be set up and the lord would stay in this chamber.
The length between two pillars was 197 cm. All the stairs were basically constructed between two pillars in Matsumoto Castle. Therefore, the higher the ceiling is, the steeper the stairs become.
It is said that this 5th floor was used as a conference room to plan defence strategies.
On the 5th floor, the ceiling is very high. Its height is 4 m 54 cm. It was too high to connect the 5th and 6th floors with a flight of stairs between two pillars. Hence, two flights of stairs were constructed with the landing in between.
The original tax in Matsumoto Domain was slightly higher than the standard. When a lord introduced new even-higher taxes on the farmers, a farmers’ revolt took place to demand the tax reduction. It is known as Kasuke Riot named after the top leader.