I have made a summary of the research in relation to the ADHD (Attention-Deficit/Hyperactivity Disorder), by focusing on ADHD in young adulthood and adulthood. I have introduced the specific nature, dysfunction and treatment for ADHD in adulthood which have been illustrated by some previous research. Also, I have been focusing on ADHD in University students, and have reported the relatuinship with the adaptation to University, the introduction of University where the advanced support has been provided for the ADHD, and the current situation regarding ADHD in Japan. Also, Ihave dealt with the issue of the feigned illness for University students in terms of ADHD, and have listed some problematic issues regarding the diagnosis of ADHD. Furthermore, Ihave submitted the proposal regarding the approach to students with ADHD in University.