Representing the first book on the topic, this work offers the reader an introduction to the Japanese systems for health technology assessment (HTA) officially introduced by the Ministry of Health, Labour and Welfare (MHLW) in 2016. Policy and guidelines are discussed, with the relevant methods and conditions of cost-effectiveness analysis explained alongside. Numerous instructive examples and exercises, ranging from basic to advanced, impart valuable knowledge and insight on the quantitative methods for economic evaluation, which will appeal to both beginners and experts. This guidebook is authored by Japan’s foremost expert in HTA and pharmacoeconomics, with a view to strengthening the reader’s expertise in value-based healthcare and decision-making. The methods presented are essential to informing regulatory, local and patient decisions; as such, the book is equally recommended to industry and government, as well as academia, and anyone with an interest in Japanese HTA.