Corporate Profile


Established in : 2008

Representative : Mitsuyo Yamamoto

Location : Pinthong Industrial Estate 1 789/108 Moo.1, Nongkham, Sriracha, Chonburi, 20230

Access Map

Business Contents : Printed circuit board assemblies, Inspection and pre-assembly services.

Number of employees : 224 As of October 18, 2019 (including contract employees).

Certification : ISO9001: obtained in 2015, ISO14001: obtained in 2015.

Introduction of Executives


Mitsuyo Yamamoto


Hiroshi Sasaki

History of the Company

  • 2007

    CELCO (THAILAND) CO.,LTD registrations.

  • 2008

    Launch of printed circuit board assembly service (ISO9001: acquired in 2008).

  • 2009

    Launch of PCBA services for Plasma TV.

  • 2012

    Launch of PCBA services for motors, and home appliances Commencement of PCBA services for air conditioners, ISO14001: Obtained 2004 certification.

  • 2016

    Launch of business inspection services.

  • 2019

    JOHNAN Corporation acquired all shares of CELCO (THAILAND) CO., LTD.

  • 2019

    Our name has been changed "JOHNAN SIAM CORPORATION LIMITED".

Group information

JOHNAN Corporation

Name : JOHNAN Corporation

Foundation : October 1962

Establishment : August, 1968

Capital : 95 million

Representative : President & CEO Mitsuyo Yamamoto

Head office : 1-28, Narute Okubo-cho, Uji-shi, Kyoto, Japan

Number of employees : JOHNAN Co., Ltd.: 618、Total of JOHNAN Group: 672

※ As of April 2019 (including part-time employees and contract employees)

Business Contents:

      ・ Develop, prototype, and manufacture of electronic parts, equipment, and film processing.

      ・ Repair service of printed printed circuit board.

      ・ Planning, manufacturing, and sales of products that improve the environment and support production.

      ・ Development, design, and manufacture of automated and labor-saving equipment.

      ・ Development, design, and manufacture of medical and healthcare-related equipment.