The Society for Risk Analysis Japan have compiled “the Encyclopedia of Risk Research” as our society’s 30^th anniversary of foundation.in 2019. Risk Research has confronted various risks in the humanities, natural sciences, and social sciences. Each academic field have been developed its own risk concept based on their own need. Thus, there are wide variety of definition for risk assessment, art of risk management, and needs of risk communication in each field. Due to the increasing interoperability and interdependence of the global society, there is an essential need to establish a cross-sectional insight of the risks. Our Encyclopedia of Risk Research 2019 contain the comprehensive aspects of the Risk Research based on four parts, 13 chapters, and 195 sections in order to clarify the current needs of risk research and the practical challenges in contemporary society. 13 chapters are here; Social Changes around Risk (Chapter 1), The art of Risk Assessment (Chapter 2), The art of Risk Management (Chapter 3), The art of Risk Communication – dialogue of risks (Chapter 4), Risk Finance – Relocation of risks (Chapter 5), Health and Environmental Risks (Chapter 6), Social Infrastructure Risks (Chapter 7), Climate Change and Natural Disaster Risks (Chapter 8), Food Safety (Chapter 9), Family, Domestic and Social Risks (Chapter 10), Financial and Insurance Risks (Chapter 11), Risk Education and Human Resource Development (Chapter 12), Emerging Risks and Social Responses (Chapter 13). This is frontend of contemporary risk research to re-review the definition of risk across disciplines. This preamble records a belief history of how to establish the Encyclopedia of Risk Research”.