Naikai Zosen Corporation

Founded as Setoda Dockyard Co., Ltd. (head office in Kobe)

Setoda Shipbuilding Co., Ltd. established [merged with Nakagiri Shipyard and Murakami Shipbuilding & Iron Works and changed its name] (head office in Kobe)

Head office relocated from Kobe to Setoda

No. 2 dock (7,500 D/W) completed at the Setoda Plant

No. 3 dock (6,500 D/W) completed at the Setoda Plant

Became an affiliated company of Hitachi Zosen Corporation

Began serial construction of large ferries

Completed March 1972, 9,235-ton ship "Marimo".

Utsumi Shipbuilding Co., Ltd. launched [Taguma Shipbuilding Co., Ltd. and Setoda Shipbuilding Co., Ltd. merged and changed their name]

Completed December 1973, 6,720-ton ship "Bega".

Listed on the Second Section of the Osaka Securities Exchange and the Hiroshima Stock Exchange

Completed December 1974, 11,880-ton ship "Ishikari".

Completed June 1975, 11,879-ton ship "Daisei".

No. 1 dock (60,000 D/W) completed at the Setoda Plant

Capital increased to 1.1 billion yen

No. 1 and No. 2 NC cutting machines and a pipe bender installed at the Setoda Plant

Won the Grand Prize at Ship of the Year 1991 (2nd edition) [Nissan Musashi Maru]

Natique Shiroyama hotel opened

Steel-section NC cutting machine installed at the Setoda Plant

130-ton jib crane (first unit) completed at the Setoda Plant

Sawa Club (supervisors' dormitory) completed

Seto Factory obtains ISO 9001 certification

Seto Factory expands block storage area by filling in Dock 2

130t jib crane (first unit) completed

December 1999, 130t jib crane completed. Enabled larger lifting blocks, improving work efficiency and reducing work time.

Listed on the Tokyo Stock Exchange (Second Section)

Seto Factory paint shop completed

Seto Factory obtains ISO 14001 certification

In 2004, an additional 130t jib crane of the same type was introduced, further improving efficiency. The lifting capacity doubled, and the maneuverability of the jib crane allowed quick and flexible response to tight work schedules.

Nakano Dormitory (single men's dormitory) completed

Seto Factory 130t jib crane (second unit) completed, expansion of the 4th and 5th ship hull factories

Merged with Nichizou IMC, creating the Inoshima Factory

In January 2005, after merging with Nichizou IMC, Utsumi Shipbuilding Inishima Factory was born. Workforce increased, and construction capabilities, including large shipbuilding, were raised, supporting Utsumi Shipbuilding's "product mix". Inishima, once called the "town of shipbuilding", had a 19-year hiatus in new ship construction; with new shipbuilding on the horizon, Utsumi Shipbuilding under the new system began operations.

Inoshima Factory automatic internal welding machine completed

Inoshima Factory main assembly shop roof completed, paint shop completed

Capital increased to 1.217 billion yen

Inoshima Factory's first launch in 20 years

In September 2006, the launch ceremony of the container ship HELENE S at Inishima Factory was opened to the public. About 2,000 people, including local residents, employees' families, and shipbuilding alumni, visited the factory to see the ship. It had been 20 years since the new shipbuilding division withdrew from Hitachi Shipbuilding Inishima Factory. The ship assembled on the slipway symbolized the revival of the "town of shipbuilding" and marked a new start as Utsumi Shipbuilding Inishima Factory.

Nakano Dormitory new building (single men's dormitory) completed

Mishou Dormitory (single men's dormitory) completed

Seto Factory expands 10th ship hull factory, introduces NC cutting machine No.3

Closed Takuma Factory, consolidating ship repair business to Seto Factory

In December 2012, a solar power plant was installed on the site of the former Takamura Factory.

Installed solar power facility on former Takuma Factory site

Received Ship of the Year 2017 (28th) Large Cargo Ship Category Award [TRANS HARMONY 1]

Installed two 200t jib cranes at Inishima Factory. This was an upgrade from the 120t jib cranes that had been the main equipment at Inishima Factory, significantly improving lifting capacity. Compared with Seto Factory (maximum 130t), the large jib cranes allowed larger blocks, enhancing equipment and production efficiency for the large shipbuilding focus of Inishima Factory.

In 2021, two 200t jib cranes were installed at Inishima Factory. This was an upgrade from the 120t jib cranes that had been the main equipment at Inishima Factory, significantly improving lifting capacity. Compared with Seto Factory (maximum 130t), the large jib cranes allowed larger blocks, enhancing equipment and production efficiency for the large shipbuilding focus of Inishima Factory.

In 2021, two 200t jib cranes were installed at Inishima Factory. This was an upgrade from the 120t jib cranes that had been the main equipment at Inishima Factory, significantly improving lifting capacity. Compared with Seto Factory (maximum 130t), the large jib cranes allowed larger blocks, enhancing equipment and production efficiency for the large shipbuilding focus of Inishima Factory.

Inoshima Factory 200t jib crane (first unit) completed

Inishima Factory 200t jib crane (second unit) completed.

Inishima Factory 100t jib crane completed.

Lemon House (Crew Quarters) completed.