Mars Komagatake

Type: Distillery and brand

At 798 metres above sea level, beneath Kiso Komagatake in Japan’s Central Alps, a historic whisky pot has become part of the display. The producer says this original Iwai-style pot worked until 2014, linking today’s distillery to an earlier chapter of Japanese whisky making.[2][4]

This is Mars Komagatake, Hombo Shuzo’s distillery in Miyada Village, Nagano Prefecture. Formerly Mars Shinshu, it took its present name in 2024. The two names belong to one distillery, not neighbouring sites or separate producers.[1]

Fact box

What Mars Komagatake is known for

Komagatake’s mountain distillery inherited its stills from Yamanashi, then weathered a long interruption in whisky production. That equipment connects the Nagano site to Kiichiro Iwai and Masataka Taketsuru, carrying an earlier chapter of Japanese whisky into its mountain setting.[2][6] Its single malt appears in dated annual editions; the wider Mars whisky portfolio also includes the Iwai blue-label blend and Iwai Tradition.[2]

Those names identify different whiskies. Komagatake is both the distillery’s name and its single malt line. Iwai and Iwai Tradition are blends, not other names for that single malt. Annual editions deserve the same precision: identify each by its full name rather than treating every Komagatake release as interchangeable.[2]

The landscape is more than a mountain backdrop. The supplied account describes soft, granite-filtered water and cool, foggy air around the distillery at the foot of Kiso Komagatake, 798 metres above sea level.[2][4] These are details of the place itself; the flavour of each bottling needs its own evidence.

From Yamanashi to Nagano

Nagano was a new home for an established whisky business. Hombo Shuzo dates its founding to 1872, the fifth year of Meiji, but its whisky history requires a distinction between securing a licence and beginning distillation.[1][3]

The sources disagree about what happened in 1949. Pour Atlas describes an initial attempt at whisky distillation in Kagoshima that year. Nomunication instead identifies 1949 as the licensing milestone and places the beginning of Hombo’s own whisky distilling at Yamanashi in 1960.[5][9] The disagreement concerns whether distillation was attempted in 1949, not simply how to date the same event.

Yamanashi supplied a crucial part of the later Nagano operation: its stills. Iwai designed them using Taketsuru’s training report, and they were subsequently moved to the new site.[2][6] The end of Yamanashi distillation is disputed too. Nomunication gives 1969; Whisky Clan, citing the SMWS, gives 1972.[4][5]

Hombo also distilled whisky at its Kagoshima factory from 1981 to 1985. In 1985, the producer records the establishment of the Shinshu Manufacturer and the transfer of the whisky licence there from Yamanashi.[1][5] The mountain distillery continued a story already shaped by both Yamanashi and Kagoshima.

Production timeline

Iwai’s stills and the Taketsuru connection

The connection with Nikka is one of knowledge and equipment, not ownership. Iwai had been Taketsuru’s senior colleague at Settsu Shuzo and received his training report. He drew on that material when designing Hombo’s stills, linking their shape to the stills at Nikka’s Yoichi distillery. The companies never shared ownership.[2]

Yoichi, linked in the navigation below, is the next stop for readers interested in this engineering lineage.

Story box: A design carried from one site to another

Founding story: Hombo’s account dates the establishment of the Nagano operation to 1985, when the whisky licence was transferred there from Yamanashi.[1] The stills designed by Iwai moved to the new site too.[2][6] A founder and the date of the site’s first licence record are not documented.

Turning point: The original Iwai-style pot worked until 2014, according to the producer, and is now displayed at the distillery. It is a surviving physical link to that equipment history.[2]

Key person: Kiichiro Iwai became an adviser to Hombo in 1950.[2]

Documented record: Taketsuru’s report informed Iwai’s design for the Yamanashi stills. Their transfer to Nagano and the displayed original pot connect that design history to the present site.[2][6]

Sources and claim mapping: Establishment in 1985: Hombo company history. Iwai’s role and the displayed pot: Hombo visiting page. Transfer and replacement description: Nomunication’s Komagatake account.

Last checked: 7 November 2026.

Verdict: Documented

Claim: Iwai used Taketsuru’s report in designing the stills that connect Hombo’s earlier whisky operation with its Nagano distillery.[2]

What the record shows: The supplied sheet recognises this technical lineage and explicitly distinguishes it from company ownership.

Evidence against or gap: The fidelity of the replacement stills is disputed. Japan Whisky Press calls them exact replicas; Nomunication describes them as slightly upgraded.[3][6]

Earliest known source: Not established from the sources checked.

Sources: Japan Whisky Press, distillery guide; Nomunication, 2 January 2019.

Last checked: 7 November 2026.

The pause and the return

Just seven years after the Nagano site opened, production stopped in 1992. The supplied account sets that shutdown against a Japanese whisky market that had peaked in 1983 and then contracted for about 25 years.[2] It is important context, though it does not establish a single cause for the decision.

Distillation stopped, but Hombo continued selling whisky from stock during the production pause. The producer dates the return of whisky distillation to 2011.[1][2] A bottle associated with the company during the intervening years is not, by itself, evidence that the Nagano stills were running.

Names require similar care. Shinshu is the distillery’s earlier name; Komagatake became its name in 2024. Neither, on its own, dates the distillation of the spirit inside a bottle.[1] Keeping production, sales and naming separate makes older accounts much easier to follow.

Komagatake, Tsunuki and Yakushima

Mars whisky can travel between distillation and maturation. Komagatake’s sister distillery, Mars Tsunuki in Kagoshima, dates from 2016. Hombo opened the Yakushima Ageing Cellar that same year.[5][7] Yakushima is a maturation location, not another distillery: the documented cellar has no stills.[8]

Komagatake Yakushima Aging Cellar provides a concrete example. Distilled in 2014, the whisky spent three years maturing on Yakushima.[6] “Komagatake” identifies its distillation origin, while “Yakushima” records where it matured. Both belong to its history, but they describe different stages.

The documented Maltage 3+25 story reaches across sites too. It combined Yamanashi and Kagoshima malts, was finished for a further 25 years at Shinshu, and won World's Best Blended Malt at the 2013 World Whiskies Awards.[5]

The clearest way through these names is to follow the spirit’s journey. Establish where it was distilled, then where it matured, then identify the release. A warehouse name can be an important part of a whisky’s identity without being the name of the distillery that made it.

Common mistakes

Treating Shinshu and Komagatake as separate distilleries. Older bottles and guides retain the earlier name. The producer records a renaming in 2024, not the opening of a second site.[1]

Assuming the production pause stopped whisky sales. The pause affected distilling. Hombo continued selling whisky from existing stocks.[2]

Beginning the whole Mars whisky story in Nagano. The 1985 opening begins this site’s history, not Hombo’s whisky activity. Both Yamanashi and Kagoshima feature in the earlier production record.[1][5]

Visiting and reading older accounts

The visitor building has documented panels on Mars Whisky’s history, and the original Iwai-style pot is described as being on display.[2][4] Before travelling, check Hombo’s official website for booking arrangements, accessibility, age rules and current visitor access rather than relying on an older guide.

For older accounts, keep three milestones in view: the establishment of the Nagano site in 1985, the resumption of distillation in 2011 and the name change in 2024. Those dates explain how an older guide can accurately describe Mars Shinshu while a current reference calls the same distillery Mars Komagatake.[1]

Where to go next

• Mars Tsunuki: follow the sister distillery’s separate production history.
• Yoichi: explore the other distillery connected with the still-design story.
• Chichibu: Ichiro's Malt: continue through the Japanese distillery reference series.

Sources

1. Hombo Shuzo. History, Company. Producer’s account, undated; supplied record checked November 2026. https://www.hombo.co.jp/en/company/history/
2. Hombo Shuzo. Mars Komagatake Distillery, Visiting Experience. Producer’s account, undated; supplied record checked November 2026. https://www.hombo.co.jp/en/visiting/komagatake/
3. Japan Whisky Press. Mars Shinshu distillery guide. Undated; supplied record checked November 2026. https://japanwhiskypress.com/mars-shinshu-distillery-guide/
4. Whisky Clan. Shinshu Mars Distillery: History, Owner and Facts. Undated; supplied record checked November 2026. https://www.whisky-clan.com/post/shinshu-mars-distillery-history-owner-and-facts-and-faq
5. Nomunication. Mars Tsunuki Distillery. Undated; supplied record checked November 2026. https://www.nomunication.jp/distillery/tsunuki/
6. Nomunication. Review: Mars Komagatake, Yakushima Aging Cellar. 2 January 2019. https://www.nomunication.jp/2019/01/02/review-mars-komagatake-yakushima-aging-cellar-d-2014-1140-bottles-59-abv/
7. Wikipedia. Shinshu Mars distillery. Revision not specified; supplied record checked November 2026. https://en.wikipedia.org/wiki/Shinshu_Mars_distillery
8. Japan Whisky Press. Tsunuki distillery guide. Undated; supplied record checked November 2026. https://japanwhiskypress.com/tsunuki-distillery-guide/
9. Pour Atlas. Mars Shinshu Distillery. Undated; supplied record checked November 2026. https://pouratlas.com/distillery/mars-shinshu

This desk-researched draft uses the supplied fact sheet and source excerpts, without first-hand tasting, a site visit or independent live verification.

Last checked: November 2026