Former Imperial Japanese Army Anti-Aircraft Artillery 2nd Regiment Searchlight Training Room
Standing quietly in a residential neighborhood of Kashiwa City, Chiba Prefecture, the Former Imperial Japanese Army Anti-Aircraft Artillery 2nd Regiment Searchlight Training Room (Shōkū Yoshūshitsu) is a remarkable wartime relic that has survived for nearly nine decades. This reinforced concrete structure, built around 1938, once served as a highly specialized facility where soldiers trained to operate searchlights and rangefinders in defense of the skies over Tokyo. Registered as a National Registered Tangible Cultural Property in 2024, it stands as one of only two surviving buildings of its kind in all of Japan.
Historical Background
From the Taishō era onward, the Imperial Japanese Army established anti-aircraft artillery regiments across the country to strengthen national air defense. Following the revision of the Imperial National Defense Policy in 1936, military capabilities were expanded, and anti-aircraft artillery regiments were deployed at eight locations across Japan, Korea, and Taiwan.
The 2nd Anti-Aircraft Artillery Regiment was first established in Kōnodai, Ichikawa City in 1935. However, because there were no nearby aviation units to coordinate air defense operations with, the regiment relocated to Nedo in the former Tomise Village (present-day Kashiwa City) in 1938. As this was a newly planned military site, a series of army facilities including the searchlight training room were constructed from scratch. That same year, Kashiwa Airfield was completed, and the air defense system protecting the imperial capital of Tokyo was put in place.
Why It Was Designated a Cultural Property
In November 2023, the Council for Cultural Affairs recommended to the Minister of Education that this building be registered as a National Registered Tangible Cultural Property (Building). It was officially registered in 2024 under Registration Criterion (3): structures that would be difficult to reproduce.
The designation recognizes the building as an invaluable surviving example of a former military facility with a highly specialized purpose. Research revealed that structures of this type were constructed at only seven locations in Japan and its overseas territories. Of those, only two survive today: this one in Kashiwa (publicly owned) and another in Kakogawa City, Hyōgo Prefecture (privately owned). The Kashiwa example is the only publicly owned specimen in the country, making it exceptionally significant for historical preservation and public education.
Architectural Features and the "Building That Created the Sky"
The building is a single-story, flat-roofed structure made of reinforced concrete. On the east face, a staircase leads to the rooftop. Two distinctive crane support pillars rise from the west side like a pair of horns — these were used to hoist the heavy rangefinder (sokuenki), an instrument for measuring the distance to targets, from ground level up to the rooftop training area.
The interior was originally a single open, high-ceilinged space with no second floor or internal partitions. Canvas was stretched across the walls and ceiling, and indirect lighting in white, orange, and blue created simulated skies representing different times of day. A projector cast images of aircraft onto this artificial sky, and trainees practiced issuing firing commands for the anti-aircraft guns. This is why the building earned the poetic nickname "The Building That Created the Sky" (Sora wo Tsukuru Tatemono).
The rooftop served as the rangefinder training area, where soldiers practiced measuring the positions of distant targets such as radio towers and radiosondes using precision optical instruments.
Postwar Transformation
After the war, the building sat vacant for some years before being converted into a fire station substation in 1967. During this renovation, a second floor was added and shutters were installed on the front wall for fire engine bays. The first floor served as the Nedo Branch of the Kashiwa City Western Fire Station until 2009, when operations relocated to the newly built Tomise Branch. The second floor was used as offices for the local Kōyanodai Town Association and the Tomise Merchants' Association until 2015.
The surrounding area, once part of the regiment's grounds, was developed into a residential neighborhood after the war. The regiment's original land divisions were carried over into the neighborhood's streets and blocks, and the searchlight training room, standing at a key intersection, has served as a beloved local landmark for decades.
Visitor Information
The searchlight training room is located approximately a 10-minute walk north from JR Kita-Kashiwa Station. While the building's interior is not open to the public, visitors can view the exterior and appreciate its distinctive silhouette, including the iconic crane pillars. The building is situated within a quiet residential area, so please be mindful of the neighbors when visiting.
The Kashiwa City Board of Education has produced a video explaining the building's history, and a 3D computer-generated reconstruction of the entire 2nd Regiment grounds is also available online through the city's digital archive.
Nearby Attractions
While in the area, visitors can explore several other points of interest. The former main gate (eimon) of the 2nd Anti-Aircraft Artillery Regiment and a sentry box also survive nearby as tangible reminders of the area's military past. A short bus ride away, the historic Fuse Benten (Tōkaisan Fuse Benten Higashi Kaizan Temple) offers beautiful temple grounds with views over the surrounding landscape. The Tone Canal, a Meiji-era waterway, provides pleasant walking paths, and nearby Teganumanuma (Lake Teganuma) is a popular spot for cycling and birdwatching.
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Q&A
- Can I go inside the building?
- No, the building is currently closed to the public. However, you can view the exterior freely, including the distinctive crane pillars and overall structure.
- What does "Shōkū Yoshūshitsu" mean?
- "Shōkū" refers to searchlight operations for illuminating enemy aircraft, and "Yoshūshitsu" means a rehearsal or training room. Together, it describes a facility where soldiers practiced searchlight targeting techniques in a simulated indoor environment.
- How do I get there from central Tokyo?
- Take the JR Jōban Line from Ueno Station to Kita-Kashiwa Station (approximately 40 minutes). From the north exit of Kita-Kashiwa Station, it is about a 10-minute walk.
- Are there other surviving buildings like this in Japan?
- Only one other example survives, located in Kakogawa City, Hyōgo Prefecture, and it is privately owned. The Kashiwa building is the only publicly owned searchlight training room remaining in Japan.
- When was it registered as a cultural property?
- The Council for Cultural Affairs recommended its registration in November 2023, and it was officially registered as a National Registered Tangible Cultural Property (Building) in 2024.
Basic Information
| Name | Former Imperial Japanese Army Anti-Aircraft Artillery 2nd Regiment Searchlight Training Room (旧陸軍高射砲第二連隊照空予習室) |
|---|---|
| Location | 443-3 Nedo, Kashiwa City, Chiba Prefecture |
| Owner | Kashiwa City |
| Construction Period | Circa 1938 (Shōwa 13) / Renovated 1967 (Shōwa 42) |
| Structure | Reinforced concrete, single-story with flat roof |
| Designation | National Registered Tangible Cultural Property (Building), registered 2024 |
| Registration Criterion | (3) Structures that would be difficult to reproduce |
| Access | Approximately 10-minute walk from JR Kita-Kashiwa Station (North Exit) |
| Interior Access | Not open to the public (exterior viewing only) |
| Contact | Kashiwa City Board of Education, Culture Division — Tel: 04-7191-7414 |
References
- 旧陸軍高射砲第二連隊 照空予習室(建造物） — 柏市
- https://www.city.kashiwa.lg.jp/bunka/about_kashiwa/culture/rekishi/shiteibunkazai/torokuyukei/syoukuyosyusitu.html
- 登録有形文化財（建造物）の登録について（令和5年11月24日） — 千葉県
- https://www.pref.chiba.lg.jp/kyouiku/bunkazai/press/2023/tourokukenzobutu106.html
- 『空をつくる建物』～高射砲第二連隊 照空予習室調査報告書～ — 柏市
- https://www.city.kashiwa.lg.jp/bunka/about_kashiwa/culture/digital-archive/3214.html
- 旧陸軍高射砲第二連隊照空予習室 — 文化遺産オンライン
- https://online.bunka.go.jp/heritages/detail/530894
- 歴史まち柏〜時と人との交差点〜 3：柏の戦争遺跡 — kamon かしわインフォメーションセンター
- https://www.kamon.center/mania/history-of-kashiwa-town-3
Last verified: 2026.04.11