CBT-E is an evidence-based treatment for adults with eating disorders (EDs). As CBT-E is a treatment for the core psychopathology of EDs rather than a specific ED diagnosis, based on the transdiagnostic cognitive behavioural theory, it is applicable to a wide range of EDs. The emphasis is on addressing the mechanisms sustaining EDs. CBT-E consists of two versions, the focused version and broad version, and two intensities, the 20-session version for non-underweight patients and 40-session version for underweight patients. CBT-E has been confirmed as effective for non-underweight patients, such as those with bulimia nervosa and binge eating disorders, and at least as effective as other treatments for underweight patients with anorexia nervosa. Better performance of CBT-E has been reported for adolescents than for adults. Inpatient CBT-E was also developed and promising results have been reported for severe anorexia nervosa. In Japan, cognitive-behavioral therapy for bulimia nervosa, implemented using a manual equivalent to the focused version of CBT-E, has been covered by insurance since April 2018. This report describes the features of CBT-E, its history, the transdiagnostic cognitive behavioural theory, efficacy and effectiveness of CBT-E, outline of the CBT-E 20 session-focused version and CBT-E education. Lastly, the issues and prospects for application and dissemination of CBT-E to clinical practice in Japan are discussed.
 <Author's abstract>