Japanese swords (Nihontō, 日本刀) are among the most iconic weapons in world history — embodying Japan’s artistry, metallurgy, and martial spirit. Over the centuries, the form and purpose of these blades evolved alongside shifts in warfare, craftsmanship, and social order.

This article introduces the main types of traditional Japanese swords, from the earliest straight chokutō to the curved tachi, katana, and the pole-mounted naginata and yari. Each section explores their structure, use, and historical context.

1. Chokutō（直刀） — The Ancient Straight Sword

The chokutō (“straight sword”) was used before the mid-Heian period and is Japan’s earliest sword form.
It features a straight, single- or double-edged blade with no curvature, influenced by continental designs from China and Korea.

Many surviving examples are ceremonial rather than practical — richly decorated with bronze or gilt fittings. The famous Gilt-Bronze Ring-Pommel Sword (Kondō-sō Kantō Tachi) and the Shichiseiken (“Seven-Star Sword,” associated with Prince Shōtoku) are representative examples.

Chokutō symbolizes the origin of Japan’s swordmaking tradition before the adoption of the curved blades that defined later centuries.

2. Tachi（太刀） — The Curved Sword of Mounted Warriors

Developed in the late Heian period, the tachi introduced the graceful curvature that became synonymous with Japanese swords.
Its blade curves deeply near the hilt — a feature called koshi-zori (“waist curve”) — making it ideal for mounted combat.

Typical tachi measure over 70 cm in blade length and are worn edge-down, suspended from cords attached to the armor belt.

Types of Tachi

• Ō-tachi (Great Tachi): Over 90 cm long, sometimes used for ritual offerings or parades.
  Examples like the Nene-kiri-maru (Hie Shrine) and Shida-ōtachi (Yahiko Shrine) are designated Important Cultural Properties.

• Standard Tachi: Around 70–80 cm, the common battlefield sword of samurai cavalry.

• Ko-tachi (Small Tachi): Under 60 cm, used in court ceremonies or as ornamental weapons.

The tachi flourished through the Kamakura period as Japan’s primary military sword, before giving way to the uchigatana as fighting moved from horseback to foot soldiers.

3. Uchigatana（打刀） — The Origin of the Modern Katana

The uchigatana (“striking sword”) is the direct ancestor of today’s katana.
While the tachi was designed for cavalry, the uchigatana evolved during the Muromachi and Sengoku periods for infantry combat.

It is worn edge-up through the belt (obi), allowing the warrior to draw and cut in a single fluid motion — a technique central to iaijutsu.

Typical characteristics:

• Blade length: 60–80 cm

• Shallow curvature with the bend concentrated toward the tip

• Lightweight and quick-drawing for indoor or close combat

As foot warfare and castle sieges replaced cavalry battles, the uchigatana became the standard weapon of samurai, merging practicality with elegance — the form most people now identify as the “katana.”

4. Wakizashi（脇差） — The Companion Sword

The wakizashi is a short sword between 30 cm and 60 cm long, worn alongside the katana as part of the daishō (“long and short pair”).

During the Edo period, the right to wear both swords became a privilege of the samurai class, symbolizing social rank and honor.
In battle or self-defense, the wakizashi served as a secondary weapon — easier to handle indoors or in confined spaces.

Common classifications:

• Large Wakizashi: 54–60 cm

• Medium Wakizashi: 40–54 cm

• Small Wakizashi: under 40 cm

Because non-samurai citizens were forbidden to carry long swords, wealthy merchants and townsmen often wore only the wakizashi for self-protection — sometimes commissioning ornate fittings that reflected both taste and status.

5. Tantō（短刀） — The Dagger of Precision and Honor

The tantō is a dagger-length Japanese sword under 30 cm, used for close-quarters stabbing.
It could be easily concealed and was often designed to pierce armor gaps.
Specialized variants like the yoroi-dōshi (“armor piercer”) had thick, strong blades for thrusting through protective gear.

By the Edo period, the tantō had taken on more ceremonial and personal roles:

• Carried by samurai women as a kaiken dagger for self-defense and moral resolve.

• Used in the ritual of seppuku to uphold honor.

• Crafted as an elegant accessory for formal attire.

Unlike the wakizashi, a tantō usually has no guard (tsuba), with a minimalist aikuchi mounting that emphasizes elegance and restraint.

6. Naginata（薙刀） — The Sweeping Blade

The naginata is a long polearm with a curved blade, designed for wide, sweeping cuts.
Its name comes from nagu — “to mow down” — reflecting its primary function.

It originated in the Heian period and dominated the battlefield through the Kamakura and Nanbokuchō eras.
Typical proportions included a 3 ft (90 cm) blade on a 9 ft (270 cm) shaft.

As spear warfare (using yari) became widespread in the late Sengoku period, the naginata declined in military use.
However, it remained popular in ceremonial contexts and among women of samurai families, who practiced naginata-jutsu as part of martial etiquette and self-defense.

7. Naginata-Naoshi no Wakizashi（薙刀直しの脇差） — Reforged Blades

When naginata fell out of use, many were shortened and remounted into swords.
These reforged blades are called naginata-naoshi no wakizashi.
They retain the broad base and elegant curvature of the original polearm, giving them a distinct, powerful profile.

8. Nagamaki（長巻） — The Long-Handled Sword

The nagamaki resembles the naginata but features a shorter shaft — roughly equal in length to the blade — and is wrapped like a katana handle.
It bridges the gap between a sword and a polearm: ideal for sweeping strikes yet maneuverable in closer combat.

Differences from Naginata:

• Shallower curve (saki-zori)

• Presence of a yokote line at the tip

• Handle bound with leather or cord

• Emphasis on both cutting and thrusting

Some historians believe the nagamaki evolved from oversized tachi modified for improved handling during foot combat.

9. Yari（槍） — The Spear of the Battlefield

The yari (“spear”) consists of a steel blade (ho) affixed to a long wooden shaft.
It became Japan’s dominant battlefield weapon from the late Muromachi to Edo periods, replacing the naginata due to its reach and simplicity in formation combat.

Varieties include:

• Omi-yari (Large Spear): Long spearhead (60 cm +) for powerful thrusts.

• Jūmonji-yari (Cross Spear): Side prongs for hooking and parrying.

• Nagae-yari (Long Shaft Spear): Shafts exceeding 4–6 m for pike formations.

The yari enabled foot soldiers (ashigaru) to fight cavalry effectively and symbolized the rise of organized infantry warfare in Japan.

10. Hoko（矛） — The Ancient Double-Edged Spear

The hoko predates the yari and appears in Japan’s earliest chronicles.
It features a broad, double-edged head suited for cutting and slashing, unlike the thrust-oriented yari.
In ancient times, hoko often held ceremonial or religious significance, used in Shinto rituals and royal processions.

Its form represents the transitional phase between sword and spear, combining both slicing and stabbing capabilities.

11. Ken（剣 / Tsurugi） — The Double-Edged Sacred Sword

The ken (also called tsurugi) is Japan’s double-edged straight sword.
Dating back to the Kofun period, it shares ancestry with early Chinese and Korean blades.

While later replaced by single-edged curved swords, the ken endured as a symbol of divinity and purity.
Notably, the legendary Kusanagi-no-Tsurugi — one of Japan’s Three Imperial Regalia — embodies the sacred status of the ken in mythology.

Some transitional blades, such as the famed Kogarasu-maru, feature both cutting edges and curvature, bridging the evolution from tsurugi to katana.

Conclusion

From the straight chokutō of antiquity to the refined katana of the samurai age, each Japanese sword type reflects the evolution of Japan’s warfare, aesthetics, and spirituality.
What began as imported bronze and iron blades became a uniquely Japanese art form — where steel, spirit, and beauty converge.

Today, these swords live on not only as museum treasures and collector’s items but also as enduring symbols of the Japanese soul.