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Private company

Hiro Naval Arsenal

WWII Japanese armament factory

The Hiro Naval Arsenal (Hiro Kaigun Kōshō or Dai-Jūichi Kaigun Kōkū-shō (11th Naval Arsenal), often abbreviated as Hiroshō) at Kure (呉), Hiroshima prefecture, was a production facility for seaplanes, flying boats, and aero engines for the Imperial Japanese Navy before and during World War II. It was largely destroyed in a raid by B-29 Superfortresses on 5 May 1945.2 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

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The Hiro Naval Arsenal (Hiro Kaigun Kōshō or Dai-Jūichi Kaigun Kōkū-shō (11th Naval Arsenal), often abbreviated as Hiroshō) at Kure (呉), Hiroshima prefecture, was a production facility for seaplanes, flying boats, and aero engines for the Imperial Japanese Navy before and during World War II. It was largely destroyed in a raid by B-29 Superfortresses on 5 May 1945.2

Products and brands

Designed and produced:

Hiro G2H - long-range bomber

Hiro H1H - biplane flying boat developed from the Felixstowe F.5

Hiro H2H - biplane flying boat developed from the Supermarine Southampton II

Read the full text

Hiro H4H - flying boat

Prototypes and experimental aircraft:

Hiro R-3 - flying boat, 1 example built

Hiro H3H1 - flying boat, 1 example built

Hiro H10H - project only, never completed

Aircraft designed by other manufacturers produced at Hiro:

Yokosuka B3Y

Nakajima B5N "Kate"

Aichi E13A "Jake"

Yokosuka D4Y "Judy"

From Wikipedia’s article on Hiro Naval Arsenal, shared under CC BY-SA 4.0.3

Subsidiaries and ownership

Owners

  • Imperial Japanese Navy

From Wikidata.1

Sources

The numbers on this page point here. Each one links to the record it came from.

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