What Is a Naginata? 薙刀 — The Japanese Polearm

A naginata (薙刀) is a Japanese polearm consisting of a curved single-edged blade mounted on a long wooden shaft, used for sweeping cuts against both infantry and cavalry. The blade itself is a true forged nihonto — hardened and bearing a hamon like a sword — but it is broader and more curved toward the tip, and it is set into a long tang buried deep in the pole rather than a hilt. The naginata was a principal battlefield weapon of warrior monks, foot soldiers, and later the women of samurai households.

For a collector, naginata are important both in their own right and because of what became of them: enormous numbers of naginata blades were later cut down and reshaped into wakizashi. Recognizing a blade's origin as a naginata is a classic point of kantei and directly affects how it is understood and valued.

How a naginata is built and used

The naginata blade is forged like any nihonto but with a distinctive profile: relatively short (often around 30–60 cm of cutting edge), widening and curving strongly toward the point, with a long tang (nakago) that runs far down into a lacquered wooden shaft one to two metres long. In use it was swung in wide arcs, its reach and momentum making it effective for cutting the legs of horses and keeping infantry at bay. It flourished from the Kamakura through the Muromachi periods and became emblematic of the sōhei (warrior monks) and, in the Edo period, of the martial training of samurai women.

Naginata-hi and identifying features

  • Naginata-hi (薙刀樋) — the characteristic grooves cut into a naginata blade: typically a long main groove with a shorter secondary groove (soebi) near the base. This grooving pattern is a key fingerprint even after a blade has been reshaped.
  • Strong tip curvature — the pronounced widening and upsweep toward the point distinguishes a naginata profile from a straightforward sword.
  • Deep, angled nakago — the long tang designed to seat in a pole differs markedly from a sword tang, and traces of it often survive.

Naginata-naoshi: reworked into wakizashi

As open warfare declined, huge numbers of naginata were converted into short swords — a reworked blade is called a naginata-naoshi (薙刀直し). Smiths reshaped the wide, curved naginata point into a more sword-like kissaki and refitted the blade with a normal koshirae as a wakizashi. Tell-tale signs that a wakizashi began life as a naginata include the surviving naginata-hi grooves, an unusually strong curve, a wide blade that narrows oddly, and a hamon that runs off in a way natural to a naginata point. Spotting a naginata-naoshi is a prized appraisal skill, and such blades are collected specifically for that history.

What a collector looks for

An intact naginata blade with its original shape, grooves, and healthy hamon is far scarcer than a katana and is valued accordingly. When examining a suspected naginata-naoshi wakizashi, collectors read the sugata and sori, look for the naginata-hi, and check the boshi and point geometry for signs of reshaping. A confirmed early naginata by a known smith, or a well-documented naginata-naoshi, carries genuine historical weight in a collection.

Frequently asked questions

Is a naginata a sword or a polearm?

A naginata is a polearm: a true forged nihonto blade mounted on a long wooden shaft rather than a sword hilt. The blade is hardened and bears a hamon like a sword, but its broad, strongly curved profile and long pole-seating tang make it a distinct weapon type.

What is a naginata-naoshi?

A naginata-naoshi is a naginata blade that has been shortened and reshaped into a wakizashi-length sword. Smiths reworked the wide, curved naginata point into a more conventional kissaki, and telltale grooves and curvature often reveal the blade's polearm origin.

How do you identify a naginata blade?

Look for a relatively short blade that widens and curves strongly toward the tip, the characteristic naginata-hi grooves, and a long tang built to seat in a pole. These features persist even when a naginata has been reworked into a wakizashi.

Who used the naginata?

It was wielded by warrior monks and foot soldiers from the Kamakura through Muromachi periods for sweeping cuts against infantry and cavalry, and in the Edo period it became strongly associated with the martial training of samurai-class women.

Keep exploring nihonto