Shikomizue: The Hidden Blade — History, Structure, and Modern Legal Status of Japan's Concealed Sword-Cane

What is a Shikomi-zue?—Basic Definition and Structure

A shikomi-zue (concealed stick) is a general term for hidden weapons that appear to be walking canes, sticks, or similar implements on the outside while concealing a blade (sword, saber, short sword, or spear point) inside. While appearing harmless as a walking aid on the surface, it functions as a sword when drawn.

Basic Structure

A typical shikomi-zue has the following structure:

Outer Casing (sheath portion): The stick body made of wood, bamboo, or metal. The exterior is crafted to be indistinguishable from an ordinary stick. A section equivalent to the koiguchi (mouth of the sheath) is positioned along the stick to hold the inner blade.

Inner Blade: The concealed blades vary widely, ranging from tanto-style (20-30 cm) to wakizashi-style (40-60 cm). The blade shapes often follow standard Japanese sword patterns like hirazukuri or shinogizukuri, though typically they feature shortened blade lengths and reduced weight for concealment.

Handle (tsuka) equivalent section: The tip end of the stick (grip side) serves as the handle. It is shaped for easy gripping when drawn and used.

Tsuba (sword guard): Some models feature a tsuba while others do not. With a tsuba, one can fight while protecting bare hands; without one, the weapon is slimmer and offers better concealment.

Hidden Weapon Culture in the Edo Period and the Birth of the Shikomi-zue

Behind the development of the shikomi-zue lay a peculiar weapon culture unique to the Edo period.

The Edo Shogunate strictly controlled swordbearing as a status symbol of the samurai class, and commoners—merchants and farmers—were in principle forbidden from wearing swords (blades 2 shaku or longer). However, necessity for self-defense led to the emergence of hidden weapon culture: carrying actual swords while maintaining the legal form of a walking cane.

Connection to Yagyu Shinkagetsu-ryu: Some schools of swordsmanship taught the shikomi-zue and the art of the hidden umbrella (umbrella technique) as self-defense implements suitable for daily carry. It is said that certain branches of the Yagyu Shinkagetsu-ryu school included instruction in "using concealed weapons."

Connection to Spies and Ninja: In period dramas and oral storytelling traditions, the image of spies and ninja carrying shikomi-zue is well established. Indeed, considering the existence of the Edo Shogunate's covert agent system, it is plausible that those operating under concealed identities carried shikomi-zue.

Swordsmen of the Bakumatsu Period and Famous Users of the Shikomi-zue

As the Bakumatsu (final years of the shogunate) approached, political assassinations and duels between swordsmen became frequent, increasing demand for the shikomi-zue.

Kawakami Gensai: A renowned "swordsman-slayer" of the Bakumatsu period and member of the Higo Royalist Party. Tradition holds that due to his small stature, he preferred short swords and concealed weapons over longer blades.

Nakamura Hanjiro (Kirino Toshiaki): A swordsman from Satsuma and master of rapid draw techniques. He is sometimes spoken of as a master of concealed weapons.

Bakumatsu-period assassins and ronin: Multiple historical records document that assassins and masterless samurai operating under concealed identities during the Bakumatsu political struggles carried shikomi-zue and hidden umbrellas.

While these figures have been exaggerated by fiction, it is certain that the image of "shikomi-zue = hidden weapon = Bakumatsu swordsman" has taken deep root in Japanese popular culture.

Types and Variants of the Shikomi-zue

Various variants of the shikomi-zue exist.

Hidden umbrella (shikomi-kasa): A blade concealed within the ribs or handle of an umbrella. Distinct schools of umbrella technique also existed.

Hidden Western-style stick: Following the Meiji Restoration, as Western clothing became prevalent, blades were incorporated into Western-style walking sticks. These were used during the transitional period from the late Edo period to the Meiji era.

Hidden pipe (shikomi-kiseru): A small blade concealed within a traditional tobacco pipe, utilizing its length. Used as an ultra-compact self-defense weapon.

Hidden folding fan: A short sword concealed within the ribs of a folding fan. Historical records indicate it was used as a self-defense tool for women or for assassination.

Legal Status in Modern Japan

While the manufacturing, possession, and sale of shikomi-zue (including the blade) remain possible in modern Japan, they are subject to strict legal regulations.

The Firearms and Swords Control Law

Blades with edges 6 cm or longer are regulated as "blades." If the concealed blade in a shikomi-zue is 6 cm or longer, the following regulations apply:

• Restrictions on possession: Possession without legitimate cause (such as registered Japanese swords) is generally prohibited.
• Prohibition on carrying: Violations may result in arrest under the law (even if legitimately possessed, concealed carrying in public spaces is problematic).
• Manufacturing and sales: Legal when antique dealers or sword merchants sell registered Japanese swords, but unregistered shikomi-zue constitute "illegal possession."

Shikomi-zue as Art and Antiques

Period shikomi-zue (made during the Edo to Meiji periods) can be legally possessed and sold by obtaining registration certificates as firearms/sword articles. Many examples are housed in museums and art galleries as artworks and antiques.

Shikomi-zue as Replicas and Practice Blades

Replica shikomi-zue made of non-metal materials or materials that cannot actually cut are subject to relaxed legal restrictions; however, if they conceal a metal blade that can actually cut, regulations apply.

Conclusion

The shikomi-zue embodies the "hidden dimension" of Japanese sword culture. Born from diverse purposes—self-defense, assassination, and concealment of identity—it carries a multilayered history spanning Edo weapon culture, Bakumatsu political violence, and modern legal regulation. As both a collector's item and subject of sword culture research, the shikomi-zue stands as an important testament to the diversity of Japanese swords.