Although the suicide risk of autism spectrum disorder (ASD) has been suggested 
to be higher than previously recognized, there are few case reports focusing on 
the process for preventing suicide reattempts. We reported that a 17-year-old 
male who had attempted suicide by jumping was admitted to our emergency 
department and hospitalized for lumbar spine fracture. In addition to the 
diagnosis of adjustment disorder, he was diagnosed as ASD according to his life 
history. This article presents the characteristics of the suicidal behaviors and 
the process for preventing a suicide reattempt associated with an adolescent 
with ASD who attempted suicide.