About us

Company name Hoyo Co., Ltd.
CEO Isao Harada
Registered address Postal code:854-0063
2542 Kaizu-machi Isahaya-city Nagasaki JAPAN
Telephone +81-957-26-6943
Facsimile +81-957-26-9586
Gross area 14,581m²
Building area 9,463m²
Capital JP¥10,000,000
Membership Nagasaki Metalworking Industrial Association.
Japan Foundry Society,inc.
All Kyushu Cast Iron Foundry Association.
Business Item Production of cast iron, cast steel and special cast steel, machining and fitting of parts for land and marine machinery.
Number of employees 100 persons (As of Nov.2011) including staff:7 and engineer:10
Main Bank The Shoko Chukin Bank . Ltd
The Eighteenth Bank , Limited
Bank of Tokyo-Mitsubishi UFJ
The Shinwa Bank , Ltd


1948 Established UCHIBORI IRON WORKS Co., Ltd at Saiwai-machi Nagasaki City, Nagasaki, Japan. Began to manufacture cast iron for Marine engine and an Industrial machinery.
1961 Introduced a machine tool and advanced to machining business.
1963 It took part in the Isahaya Kaizu Industrial complex concept and moved into current site in complex.
1975 Introduced a thyristor inverter type high frequency induction furnace (0.5t x 2) and began to manufacture special cast steel in addition to cast iron.
1982 Introduced the latest machine tool such as three axis electronic copy milling machine and NC boring machine etc.
1985 Introduced a thyristor inverter type high frequency induction furnace (3.0t x 2) .
1985 Certified Class Lloyd(LR)
1987 Introduced vacuum type optical-emission-ectrometry equipment. The metal analysis capability was strengthened and improved.
1990 Introduced the φ1.6m NC turning machine.
1991 Transferred a casting section to the second factory (inside of an industrial complex). The renewal of equipment and new layout was completed.
1991 Certified Class NORISKE VERITAS (NV)
1995 Rebuilt building of machine shop and introduced the φ3.0m NC turning machine and 5-face-NC boring machine.
1995 Changed company name to HOYO CO.,LTD.
1999 Certified Class Korea(KR)
1999 August: introduced a private electric generator and a large-sized dust separator.
2004 January: Introduced the band saw machine.
2004 March: Introduced the Plasma cutting machine.
2005 March: Introduced the vertical machining center and NC millimg machine.
2006 March: Introduced the vertical machining center in addition
2007 July: Introduced the vertical machining center in addition
2008 June: Certified ISO 9001:2000, JISQ9001:2000
2009 August: Introduced φ2.0m NC turning centre
2012 August: Introduced the NC milling machine in addition