top of page



Salt making and policy that has been passed down with continuous cotton

While developing Shioda, the founder, Takezaemon, also focused on the construction of the mansion. As a generation, they came to fruition as Shioda 161 Choho and the magnificent site of Oshoya.

The Nozaki family has endeavored to maintain and expand the remaining property without damaging it by the policy transmitted to the Nozaki family. Naikai Salt Industries continues to make salt, and the Ryuo Kaikan, a public interest incorporated foundation, manages the vast site that has become a national important cultural property and a historic site of the prefecture. We will continue to carry on the history that has been passed down continuously.


I'm a paragraph. Click here to add your own text and edit me. I'm a great place for you to tell a story and let your users know a little more about you.

Bunsei 12 (1829)

Buzaemon Nozaki builds an Irihama salt farm in Kojima

Tenpo 9th year (1838)

The Nozaki family's nagayamon and Onarimon are completed

Kaei 5th year (1852)

The Nozaki family's front office is completed

Bunkyu 3 (1863)

Former Nozakihama Lighthouse completed

1890 (Meiji 23)

Bukichiro Nozaki is elected as a member of the House of Lords

1894 (Meiji 27)

Nozaki Takezaemon's honoring monument "Nozaki Takezaemon Otokoku monument" was erected.

1896 (Meiji 29)

The Nozaki family villa, the villa, is completed.

1908 (Meiji 41)

Kojima Merchant Marine School is established with a donation to commemorate the 60th birthday of Takeyoshiro

Showa 9 (1934)

Established Nozaki Office Co., Ltd. by changing the private management of the Nozaki family

Showa 21 (1946)

Nozaki Office Co., Ltd. changed its name to Utsumi Salt Industry Co., Ltd.

Showa 45 (1970)

Established Ryuo Kaikan Foundation

1974 (1974)

Former Nozakihama Lighthouse is designated as an Important Cultural Property of Kurashiki City

1974 (1974)

Utsumi Salt Industries Co., Ltd. changed its name to Naikai Salt Industries Co., Ltd.

1977 (1977)

The old Nozaki family's house is designated as a historic site in Okayama Prefecture

1981 (Showa 56)

Published "Study of Bizen Kojimanozaki Family-History of Establishment of Naikai Salt Industries Co., Ltd.-"

1985 (1985)

Published "Motonozaki Hama Fudoki"

1987 (1987)

The Nozaki family's old house is open to the public

1991 (Heisei 3)

Published "Kojima Salt Industry History Chronology"

1995 (Heisei 7)

Registered as a museum as the Nozaki Family Salt Industry History Museum

1997 (Heisei 9)

Renovated Okakura into Exhibition Hall 2

2004 (2004)

Takezaemon Nozaki monument is registered as a national tangible cultural property building

2005 (Heisei 17)

Ryuo Kaikan Foundation receives approval from a specified public interest promotion corporation

2006 (Heisei 18)

Published "Nozaki Family Old Home Survey Report"

2006 (Heisei 18)

The Nozaki Family Historic Residence is designated as a national important cultural property

2007 (Heisei 19)

Published "Konisi Masutaro, Tolstoy, Takeyoshiro Nozaki-The Trajectory of Friendship"

2010 (Heisei 22)

Achieved 1 million visitors

2010 (Heisei 22)

Published "Study of Nozaki Taiwan Salt Industry-Modern Japanese Salt Industry / Taiwan Salt Industry-"

2011 (Heisei 23)

Ryuo Kaikan Foundation Moved to Ryuo Kaikan Foundation

2012 (Heisei 24)

"People and works related to the Shioda Onozaki family" was held at the Okayama Prefectural Museum of Art, and an exhibition catalog was published.

2013 (Heisei 25)

"Shioda Onozaki Family Individuality Gathering Regional Salon" was held at the Okayama Prefectural Museum of Art, and an exhibition catalog was published.

2013 (Heisei 25)

The Nishiki bulrush bulrush in the collection is designated as an important cultural property of Kurashiki City.

2015 (Heisei 27)

"King Shioda's Elegance" was held at the Kanazawa Noh Museum, and an exhibition catalog was published.

2017 (Heisei 29)

"Nozaki Family Noh Theater Collection" was held at the National Noh Theater, and an exhibition catalog was published.

2017 (Heisei 29)

Certified as a cultural property of the Japanese heritage "Kurashiki story starting from a single cotton"

2018 (Heisei 30)

Certified as a cultural property of the Japanese heritage "a different space spun by men's dreams beyond the rough seas"


Irihama salt farm




Takezaemon Nozaki monument


History of salt making


In Japan, where there are no rock salt resources, salt has been made from seawater since ancient times.
The founder, Buzaemon Nozaki, built the Irihamashiki salt farm in Kojima, Kurashiki City, taking advantage of the natural benefits of the Seto Inland Sea, which has many sunny days and a large tidal range.
The Irihama-style salt pan is a method of collecting seawater (kansui ... concentrated salt water) by oozing seawater drawn in using the difference in tides onto the surface of the sand by capillarity, and continued from the early Edo period to the 20s of the Showa period. I did.


Motonozaki beach

Buzaemon completed about 48 hectares of Motonozaki beach in Kojima, Kurashiki city as of 1829.
The salt pans are divided into independent work units with an area of about 2 hectares as "Ichishioto" (also called "Ichihama" or "Ichikenmae"), and Motonozakihama is divided into 24 Shioto. rice field.


Higashinozaki beach

The motivation for reclamation of Takezaemon was further poured into the eastern part of the Kojima Peninsula. It was developed and both beaches were collectively called Higashinozakihama.


Irihama Shioda method

The salt pans were built to be below sea level at high tide and above sea level at low tide. The soil quality of the salt pan is 10 to 15 cm thick sandbox or similar sticky sand. rice field.



I used to go to the beach to mix the sand and keep it moistened evenly. There are several types of Hamabiki, and in order to improve the efficiency of vaporization, Uehamako instructed him to judge the situation at that time and change the Hamabiki method.



The person who works to bring the salted sand around the Numai is called Yoseko. Yoseko was a woman, and there were four in Ichihama. This beach work with two hours of actual working hours was an affordable side job for housewives.



Hamako threw the salt-attached sandbox, which was pushed by the sandbox, into the Numai, stepped on it with her feet, and poured in seawater. These works are collectively called "saikan".


Flow-down salt pan method

From the latter half of the 1945's, the salt pans in Japan were gradually converted to down-flow salt pans.
In the flow-down type, the seawater pumped up is poured into a gently sloping flow-down board, sent to the upper part of the "branch rack" made by combining bamboo twigs, and dripping to the lower part. .. By repeating this, it is a method of collecting brine by making the best use of solar heat and wind power.
As a result, the production volume has been reduced to three times and the labor force has been reduced to one tenth compared to the Irihama type, resulting in a significant improvement in productivity.


Membrane concentration salt production method

In 1969, a membrane concentration salt factory was completed at Higashinozakihama. In the membrane concentration salt production method, the exchange membrane does not allow contaminants to pass through, so salt can be produced safely and efficiently from seawater.

The beautiful Seto Inland Sea is dotted with calm seas and many islands. The former salt farm site of Motonozakihama, which has contributed to salt production for many years, was reborn with the opening of the Seto Ohashi Bridge in 1988.

bottom of page