Introduction

Standing quietly along the historic Wakayama Kaido highway in the rural Iinan district of Matsusaka City, Mie Prefecture, the Former Iinan Post Office Building (旧飯南郵便局局舎) is a striking testament to Japan's early 20th-century modernization. Built in 1932 (Showa 7), this reinforced concrete structure served as the Kakino Post Office for nearly six decades before closing in 1989. Registered as a National Registered Tangible Cultural Property in 2011, the building preserves a fascinating chapter of postal history and architectural ambition in a mountainous countryside setting.

Historical Background

The Iinan area of what is now southern Matsusaka City has long been a crossroads of travel and trade. The Wakayama Kaido, the road on which this post office stands, was a major Edo-period highway connecting Matsusaka with Wakayama across the Kii Peninsula. It served as the domain road of the Kishu (Wakayama) clan, a pilgrimage route to the Ise Grand Shrine and the sacred sites of Kumano and Yoshino, and a commercial artery for seafood and goods traded between the Ise-Shima coast and the Yamato region.

In 1932, at the height of the early Showa era, this post office was erected as the Kakino Post Office (柿野郵便局), named after the former town of Kakino. In 1956, the towns of Kakino and Kayumi merged to form Iinan Town, which was later absorbed into Matsusaka City in 2005. Despite these administrative changes, the post office building remained in continuous use until 1989 (Heisei 1), faithfully serving the local community for 57 years.

Why It Was Designated a Cultural Property

The Former Iinan Post Office Building was registered as a National Registered Tangible Cultural Property (Building) on January 26, 2011. Its cultural significance lies in several key aspects.

First, it is one of the earliest reinforced concrete structures built in the Iinan district. In the early 1930s, reinforced concrete construction was still a novelty in rural Japan, and the decision to build a post office from this modern material in a mountainous agricultural community speaks volumes about the ambitions and aspirations of the era. The building thus serves as a physical marker of how modernization reached even remote corners of Japan.

Second, the structure embodies the simple, functional aesthetic of early Showa-era public buildings. With its clean lines, pairs of tall vertical windows, and a rooftop tower (塔屋), the building strikes a balance between Western-influenced modern design and the practical needs of a rural postal facility. It represents a type of architecture that is rapidly disappearing from the Japanese countryside.

Architectural Highlights

The building is a two-story reinforced concrete structure with a tower extension on the roof, covering a building area of approximately 80 square meters. Its facade faces the Wakayama Kaido and features distinctive pairs of tall, vertically oriented sash windows that lend the exterior a dignified yet understated character. The overall composition is described as simple and solidly constructed — qualities that were hallmarks of post office architecture designed to project reliability and permanence.

The rooftop tower, a common feature of early Showa-era post offices and public buildings, adds a modest vertical accent to the structure. Such towers often served practical purposes, such as housing communication equipment, while also functioning as a visual landmark for the surrounding community. The building's survival in good condition for over nine decades is itself a testament to the durability of its construction.

Visitor Information

The Former Iinan Post Office Building is located at Yokono, Iinan-cho, Matsusaka City, Mie Prefecture (三重県松阪市飯南町横野字殿垣内212-3). As it is privately owned, the interior is not open to general public viewing. However, the building's distinctive exterior can be appreciated from the street, and it makes for a rewarding stop for architecture enthusiasts and cultural heritage travelers exploring the Wakayama Kaido route.

The nearest railway station is Tochihara Station on the JR Kisei Main Line, though the Iinan area is best accessed by car. From central Matsusaka, the drive along National Route 166 takes approximately 30 minutes and follows much of the historic Wakayama Kaido corridor. There is no dedicated parking for the building, but roadside parking is available in the area.

Surrounding Attractions

The Iinan district and the broader Wakayama Kaido corridor offer a wealth of cultural and natural attractions for visitors. The area around Kayumi is home to the Kayumi Ijiri Archaeological Site (粥見井尻遺跡), where some of the oldest clay figurines (dogu) in Japan were discovered, designated as a Mie Prefectural Cultural Property. The Matsusaka City Cultural Properties Center (はにわ館) in central Matsusaka displays haniwa and other archaeological finds from the region.

Further along the Wakayama Kaido toward the mountains, the Koukakyo Gorge (香肌峡) in the Iitaka district offers spectacular scenery, with emerald-green river waters framed by forested peaks. The area is also known for the Iinan Tea (飯南茶), one of the finest tea-producing regions in Mie Prefecture, and visitors can enjoy local tea products at roadside shops and the Michi-no-Eki Iinan (道の駅 飯高駅) rest area nearby.

In central Matsusaka, visitors should not miss the Matsusaka Castle Ruins (松坂城跡), a National Historic Site, and the Former Hasegawa Jirobei Residence (旧長谷川治郎兵衛家), an Important Cultural Property that showcases the grand lifestyle of Edo-period Matsusaka merchants.

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Q＆A

QCan I go inside the Former Iinan Post Office Building?
AThe building is privately owned and not open to the public for interior viewing. However, you can admire its distinctive reinforced concrete facade and rooftop tower from the adjacent Wakayama Kaido road.
QHow do I get to the Former Iinan Post Office Building?
AThe building is located in Yokono, Iinan-cho, Matsusaka City. By car, take National Route 166 from central Matsusaka heading southwest; the drive takes about 30 minutes. Public bus services from Matsusaka Station also run to the Iinan area, though schedules may be limited.
QWhat is the Wakayama Kaido?
AThe Wakayama Kaido is a historic highway that crosses the Kii Peninsula east to west, connecting Matsusaka with Wakayama. During the Edo period, it served as a domain road for the Kishu clan, a pilgrimage route to Ise, Kumano, and Yoshino, and a major trade route. Today, National Route 166 follows much of its original path.
QWhen was the building originally constructed, and when did it stop operating as a post office?
AThe building was constructed in 1932 (Showa 7) as the Kakino Post Office. It operated continuously for 57 years until it closed in 1989 (Heisei 1). It was registered as a National Registered Tangible Cultural Property in 2011.
QAre there other registered cultural properties nearby?
AYes, Matsusaka City has numerous registered and designated cultural properties. Notable nearby examples include the Matsusaka City History and Folklore Museum (the former Iinan District Library building) and the Matsusaka City Cultural Properties Center (the former Kanebo Cotton Thread Warehouse), both of which are Registered Tangible Cultural Properties.

Basic Information

Name Former Iinan Post Office Building (旧飯南郵便局局舎)
Designation National Registered Tangible Cultural Property (Building)
Registration Date January 26, 2011
Year Built 1932 (Showa 7)
Structure Reinforced concrete, 2 stories with rooftop tower; building area approx. 80 m²
Original Name Kakino Post Office (柿野郵便局)
Ownership Privately owned
Address 212-3 Tonogaito, Yokono, Iinan-cho, Matsusaka City, Mie Prefecture 515-1302
Access Approximately 30 minutes by car from central Matsusaka via National Route 166

References

旧飯南郵便局局舎 - 松阪市公式ホームページ
https://www.city.matsusaka.mie.jp/site/culture-info/kyuiinanyubinkyokukyokusya.html
松阪市の文化財 - 松阪市公式ホームページ
https://www.city.matsusaka.mie.jp/site/culture-info/matsusakashi-bunkazai.html
和歌山街道 - Wikipedia
https://ja.wikipedia.org/wiki/%E5%92%8C%E6%AD%8C%E5%B1%B1%E8%A1%97%E9%81%93
みえの歴史街道 和歌山街道 - 三重県
https://www.bunka.pref.mie.lg.jp/kaidou/rekisi/rekisi8/index.htm
飯南町 (三重県) - Wikipedia
https://ja.wikipedia.org/wiki/%E9%A3%AF%E5%8D%97%E7%94%BA_(%E4%B8%89%E9%87%8D%E7%9C%8C)

Last verified: 2026.04.13