#200「山田浅右衛門」
Known as "Kubikiri Asaemon" (the Headcutter), the Yamada Asaemon family carried out more than 2,400 executions across nine generations in Edo-period Japan. But the real story is that they were officially licensed sword testers for the shogunate — and entrepreneurs who manufactured medicine from corpses. The executions, it turns out, were nothing more than a way to procure raw material.
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What this episode answers
What kinds of punishments existed in the Edo period?
In ascending order of severity: admonishment, strict admonishment, hand shackles worn for 30 to 100 days, flogging, tattooing, exile, and banishment from Edo; the most severe was the death penalty, with sub-categories including crucifixion and beheading with public display of the head. The period's intense emphasis on shame was woven into every level of the system.
What skills did Yamada Asaemon need to carry out executions?
The executioner had to strike the 4–6 mm gap between the third and fourth cervical vertebrae in a single blow; two misses were permitted, but a third required stabbing the chest instead — an outcome considered a profound disgrace for any swordsman.
Why did Yamada Asaemon volunteer to perform executions — and even pay for the privilege?
Accepting execution work meant obtaining corpses to use in the family's primary business of sword testing; Asaemon handed the entire testing fee — worth roughly 50,000 yen today — to the doshin officer, and even sent gifts to keep a steady supply of work coming in.
What was the work of sword testing (tameshigiri)?
As officially licensed sword testers for the shogunate, they stacked corpses of condemned criminals on the execution platform (dodan) and measured how many bodies a single stroke could cut through; the all-time record was a blade called Nanatsu-do Otoshi Kanafusa, said to have cut through seven stacked bodies in one blow.
How did Yamada Asaemon build wealth rivaling that of a daimyo?
In addition to sword-testing fees, Asaemon manufactured and sold medicine made from the organs of corpses — widely believed to have healing properties in the Edo period — and published sword-appraisal catalogs, accumulating wealth equivalent to a daimyo with 30,000 to 40,000 koku despite holding the status of a ronin.
Edo Japan's Surprisingly Varied Punishments
Edo-period law carved punishment into finely graded steps based on the severity of the crime. The lightest was *shikari* — a formal reprimand in which an official scolded the offender in public. By modern standards that sounds trivial, but in a society that placed shame above almost everything else, public humiliation was a genuine sanction.
Moving up the scale came *kitto shikari* (strict reprimand), *tezusari* (hand shackles worn for 30 to 100 days), and *tataki* (controlled flogging). Tattooing varied by region: in the area around present-day Hiroshima, a first offense earned a horizontal bar on the forehead — the character *ichi*, meaning "one." A second offense added strokes to make the character *na*; a third added one more to spell *inu* ("dog"). The progression was deliberately insulting: *inu* was considered more degrading than *dai* ("great").
More serious crimes brought exile (*shima-nagashi*), banishment from Edo, or death. Capital punishment had its own gradations: crucifixion followed by three days on public display; *nokogiri-biki*, in which the condemned was buried to the neck and passersby were invited to saw at the throat with a handsaw (in practice almost never carried out, since no one volunteered to do it); and *uchikubi gokumon*, beheading followed by mounting the head for public display — a double-layered disgrace.
The Exceptional Skill of Yamada Asaemon
The Yamada Asaemon (山田浅右衛門) family held the role of executioner across nine generations, severing more than 2,400 heads in documented history — 200 to 300 per generation. The task demanded precise anatomical knowledge. The bones of the neck that support the skull are extremely sturdy; if the blade strikes bone, the cut fails. The executioner had to hit the 4–6 mm gap between the third and fourth cervical vertebrae in a single stroke. That difficulty was compounded by the fact that condemned criminals trembled with fear, making the target a moving one.
The rules allowed two failed attempts — described in the episode as "two strikes in baseball" — but a third failure meant driving the sword into the chest to finish the job, a mark of incompetence that brought lasting shame. Asaemon's training method was to stand two tatami mats on their edges side by side and practice swings through the few-millimeter seam between them, over and over.
The job formally belonged to *doshin*, low-ranking shogunate officers, but the pressure was immense and no one wanted it. Asaemon stepped in as a willing substitute.
Executions Were Just "Procurement"
Why would Asaemon perform executions not only for free but actually pay for the privilege? The answer lies in the family's real business: *otameshi goyō*, officially licensed sword testing for the shogunate.
In an era of prolonged peace there were no battles in which to test a blade's cutting power. The solution was to use the corpses of condemned criminals. Bodies were stacked on the execution platform — the *dodan* — and a swordsman cut through as many as possible in a single stroke to grade the blade. (The word *dotanba*, meaning "last moment" or "at the brink," derives directly from this practice.) The all-time record was attributed to a sword called Nanatsu-do Otoshi Kanafusa, said to have cut through seven stacked bodies in one blow.
Executions were therefore a way to stock the workshop with raw material. Asaemon handed over the entire sharpening fee paid by the shogunate — two *bu* of gold, worth roughly 50,000 yen today — to the doshin officer, and on top of that sent gifts, all to keep the work flowing his way. When demand from daimyo and hatamoto outstripped the supply of fresh corpses, used bodies were sewn back together and recycled.
Medicine Was the Biggest Revenue Stream
After testing, the corpses had one more use. Edo society widely believed that human organs had medicinal properties, and Asaemon manufactured and sold medicine from the remains. The medicine became enormously popular and sold out quickly — which tells us that for the people buying it, it genuinely seemed to heal.
These multiple income streams gave Asaemon, despite holding the status of a *ronin* (masterless samurai), economic power equivalent to a daimyo with 30,000 to 40,000 *koku*. Publishing illustrated sword-appraisal catalogs, drawing on decades of testing experience, added yet another source of income.
Respect for the Dead and the End of an Era
With his earnings, Asaemon built a memorial tower called *Mototorizuka* to comfort the souls of those he had executed — a concrete gesture of respect for the dead. His meticulous professionalism and genuine skill earned trust even among condemned prisoners. When beheading was abolished in the Meiji period, some death-row inmates reportedly requested that Yamada Asaemon personally carry out their execution. He is remembered not as a figure of terror, but as a craftsman who honored the dead more sincerely than anyone.
Takeaways
- The Yamada Asaemon family executed over 2,400 people across nine generations, but the executions were a sideline — merely a way to procure corpses for their main business of officially licensed sword testing.
- Execution required striking the 4–6 mm gap between the third and fourth cervical vertebrae in a single blow; Asaemon trained by swinging a sword through the seam between two tatami mats stood on their edges.
- Asaemon's primary income came from sword-testing appraisals and selling medicine made from corpses, giving the ronin family wealth equivalent to a daimyo with 30,000 to 40,000 koku.
This article is edited from a machine transcript of the first 30 minutes of the episode. It is not an official summary — please listen to the episode itself.