The Shed Where Toyota's First Passenger Car Came Together
The Aichi Steel Kariya Plant Former Prototype Factory East Wing (愛知製鋼刈谷工場旧試作工場東棟, also known as the former automobile department prototype shop of Toyoda Automatic Loom Works) is a single-story timber workshop in Toyodacho, Kariya City, Aichi Prefecture, listed as a Registered Tangible Cultural Property on 10 May 2018.
Kiichiro Toyoda set up an automobile department inside Toyoda Automatic Loom Works on 1 September 1933, ten years to the day after the Great Kanto Earthquake. The prototype shop went up on the Kariya site in March 1934, and it was not a single building in the modern sense. Sheet-metal and assembly bays, a machining and finishing bay, a store, and a materials testing laboratory sat under one roof.
The scale of the gamble is easier to grasp with the market numbers. Ford and General Motors were assembling cars in Japan at the time, and imports plus locally assembled foreign models accounted for roughly nine tenths of a market of a little over 30,000 vehicles a year. The engineers here began with steel research, cast cylinder blocks until the rejects piled up, and beat body panels by hand.
The first A1 prototype passenger car was finished in this shop in May 1935. A G1 truck prototype followed that August. In August 1937 the automobile department was spun off as Toyota Motor Co., while the steel department on the same site later became Aichi Steel Corporation, which is why a steelmaker's name now sits on the front of the building. What stands today is not the whole 1934 structure: between 1945 and 1948 the shop was reduced in size and split in two, leaving the East Wing at 934 square meters and the West Wing at 758.
Why This Building Is on the Register
The Aichi Steel Kariya Plant Former Prototype Factory East Wing qualified under the criterion covering structures that would be difficult to reproduce. It carries registration number 23-515 and belongs to the ninetieth round of registrations; the West Wing next door was listed the same day as a separate entry, number 23-516. Registered Tangible Cultural Property status works by notification rather than permission, so a listed building is expected to stay in use rather than be frozen.
The Agency for Cultural Affairs gives three grounds. The timber roof frame uses king-post trusses. The interior is kept as one room, with free-standing posts running along a central line. And the building holds a place in the history of Japanese car manufacturing as the shop where the A1 prototype was born. Architecture and industrial history sit side by side in the citation, which is unusual.
Kariya City frames the building as a representative example of Japanese factory construction of its period, noting that the fire and earthquake countermeasures worked out for large timber buildings from the late nineteenth century onward can be read in a single structure here.
Both wings have since been repaired and are open to visitors under the name Toyota's Prototype Plant, run by the Toyota Commemorative Museum of Industry and Technology. Two wooden sheds from the founding years, standing inside a working steel plant, are what the register protects.
What to Look For Inside the East Wing
The interior is a single undivided space. A row of free-standing posts marches down the centre line, and apart from that the 934 square meters of floor are open. Engine trials, sheet-metal work, and assembly all had to happen under this one roof, and the plan reflects that.
Look up and the king-post trusses are plain to read. A vertical post at the ridge, diagonal struts dropping to either side, and the roof load carried out to the walls: this was how builders spanned a wide span in timber when steel framing was still expensive. Getting the joints at the head of the king post to hold is the whole problem of the technique, and it is visible from the floor.
The roof is clad in metal sheet, and from outside the gable runs long on the east to west axis with almost no ornament. That plainness is the point. Nothing here was shaped by taste, so the structural logic of the building reads clearly.
A viewing room on the tour route holds a one-fifth scale model of the A1 prototype passenger car. No original A1 survives anywhere, so this model is the practical way to see what the car looked like.
The West Wing stands immediately alongside. The two were one building before the postwar split, and the West Wing was finished differently: zinc-plated iron sheet on the outer walls, and the same sheet wrapped around the internal posts. Walking from one wing into the other, the contrast in how each was protected is easy to pick up.
Visiting the East Wing
The Aichi Steel Kariya Plant Former Prototype Factory East Wing is open to the public and admission is free, but every visit has to be booked in advance because the building sits inside an operating steel plant. There is no walk-up entry. Tours are guided, last 40 minutes, and run four times a day at 9:30, 11:00, 14:00 and 15:30, with up to 50 people per slot. The facility is open between 9:30 and 17:00.
Closing days are the reverse of what most travellers expect: Saturdays, Sundays and public holidays, plus the New Year period, Golden Week in early May, and the summer shutdown. Bookings are taken through the official website's reservation form or by fax, from three business days ahead up to 90 days out. The reservation site is in Japanese only, so visitors without Japanese may want help from a hotel concierge or a Japanese-speaking companion when booking.
Getting there is straightforward. Kariya Station, served by the JR Tokaido Line and the Meitetsu Mikawa Line, is about a 15-minute walk away. The address is 6 Toyodacho 3-chome, Kariya City. The meeting point and parking arrangements are sent out with the booking confirmation, and arriving ten minutes before the tour starts is expected.
On photography, the operator's website carries no stated rule, so the safe approach is to ask when booking and to follow the guide on the day. Cars and trucks move around the site, and visitors stay with the guide throughout. There is no meeting room or lounge, and toilets are limited in number. No cars are built here now; this is a preserved building, not a production tour.
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Q&A
- Can you visit the Aichi Steel Kariya Plant Former Prototype Factory East Wing, and is a reservation required?
- Yes, it is open to the public as Toyota's Prototype Plant, and a reservation is required for every visit. Bookings are made through the official website's form or by fax, from three business days ahead up to 90 days in advance. There is no same-day entry.
- How much does it cost to visit the former prototype factory East Wing, and how long is the tour?
- Admission is free. Tours are guided and run 40 minutes, four times daily at 9:30, 11:00, 14:00 and 15:30, taking up to 50 people per slot.
- How do you get to the former prototype factory East Wing from the nearest station?
- Kariya Station on the JR Tokaido Line and the Meitetsu Mikawa Line is about 15 minutes on foot. The site is at 6 Toyodacho 3-chome, Kariya City, inside the Kariya plant of Aichi Steel Corporation, and the meeting point comes with your booking confirmation.
- Is the original A1 prototype car displayed at the former prototype factory East Wing?
- No original A1 survives. A one-fifth scale model is shown in the viewing room instead. The first A1 was completed in this shop in May 1935.
- When is the former prototype factory East Wing closed, and is photography allowed?
- It closes on Saturdays, Sundays and public holidays, and during the New Year period, Golden Week and the summer shutdown. The operator publishes no photography rule, so ask when you book and follow the guide's instructions during the tour.
Basic Information
| Name | Aichi Steel Kariya Plant Former Prototype Factory East Wing (愛知製鋼刈谷工場旧試作工場東棟) |
|---|---|
| Location | 6 Toyodacho 3-chome, Kariya City, Aichi Prefecture |
| Designation | Registered Tangible Cultural Property (structure), registration no. 23-515 |
| Year Designated | Registered 2018 (Heisei 30) |
| Quantity | 1 building |
| Dimensions | Single-story timber structure, metal-sheet roof, building area 934 square meters |
| Owner | Aichi Steel Corporation |
| Public Access | Open as Toyota's Prototype Plant by advance reservation (free, 40-minute guided tour, closed weekends and public holidays) |
References
- National Cultural Properties Database, Aichi Steel Kariya Plant Former Prototype Factory East Wing / Agency for Cultural Affairs
- https://kunishitei.bunka.go.jp/heritage/detail/101/00012376
- Aichi Steel Kariya Plant Former Prototype Factory East Wing, Registered Tangible Cultural Property / Kariya City
- https://www.city.kariya.lg.jp/kankobunka/rekishibunka/bunkazai_iseki/1006420/1013615/1013247.html
- About Toyota's Prototype Plant / Toyota's Prototype Plant
- https://k.tcmit.org/about/
- Facility Guide / Toyota's Prototype Plant
- https://k.tcmit.org/information/
- Access / Toyota's Prototype Plant
- https://k.tcmit.org/access/
- Toyota's Prototype Plant / Toyota Commemorative Museum of Industry and Technology
- https://www.tcmit.org/about/ktcmit/
Last verified: 2026.08.30