Jinmaku (陣幕) is a curtain that was historically used when setting up a military encampments, and today are used at festivals and theatres.

In regards to military encampments, jinmaku were previously referred to as gunmaku (軍幕).

— History

There are references to the use of jinmaku as early as the Nara period. They were tied to polls, called makukuji (幕串), and stretched around encampments to form a defensive barrier. There are writings that explain that at night, soldiers would sleep in an area protected by jinmaku for protection.

Jinmaku became standardized, their construction and style, during the Muromachi period. During the Edo period, a famous military manual described these standards.

According to the manual, jinmaku are to be 1.5 m tall and 8.4 m wide. Makukuji are set to a limit of 10 for an officer, and 8 for other soldiers. Tethers could only be white, black, or blue. Mon clan emblems are placed between 3, 5, and 7 places.

During the Edo period, religious meaning was given to jinmaku and became known as a sacred item. They were thought to have the power to repel evil.