This paper presents an overview of psychological research into stalking and discusses some future issues for Japan. We review research on stalking since the 2000s but exclude review articles and case studies. Previous studies have focused on groups such as college students，genera1 citizens，clinic staff members and police officers. We highlight four aspects of the research literature. First, one can observe confusion over various definitions, such as romantic relationships, fear, stalker intent and repeated behaviors. Second, estimates of stalking prevalence rates vary widely from 2.2 % to 87%. Third, research that focuses on risk factors indicates that stalking is associated with demographics, romantic relationships，personality and victim lifestyle. Finally, few studies have addressed coping strategies and seeking help. There is a lack of research into stalking within Japan. Taking these factors together, future research needs to clarify the definitions of stalking，conduct psychological studies of stalkers and their victims and to explore the risk factors within Japan.