Quest Co., Ltd. engages in the provision of information services that include consulting service, system development and maintenance and, infrastructure service. It operates through the following segments: System Development, Infrastructure Service, and Others. The System Development segment provides various operation system consulting services and also handles system design, development, and maintenance. The Infrastructure Service segment offers various systems for client's companies such as infrastructure and system operations, monitoring business, helpdesk, and technological services and technical support services. The Others segment includes consignment calculation and purchase product sales business. The company was founded by Hiroshi Uchida on May 14, 1965 and is headquartered in Tokyo, Japan.