Objectives: To compare experiences regarding the perpetration of intimate partner violence among Japanese university freshmen between 2008 and 2014.Study design: Two-stage cross-sectional study.Methods: A self-administered questionnaire survey was completed in both 2008 and 2014 by students at the same university.Results: There were significant reductions in episodes of verbal harassment (adjusted odds ratio [AOR]: 0.601, 95% confidence interval [CI]: 0.382, 0.945, P = 0.027) that occurred when a boy/girlfriend said “you don’t give me priority” to his/her partner when they did not see them (AOR: 0.450, 95%CI: 0.207, 0.979, P = 0.044), and also in instances of irritation that resulted when a boy/girlfriend disobeyed his/her partner (AOR: 0.385, 95%CI: 0.161, 0.921, P = 0.032) from 2008 to 2014. The perpetration scores were reduced from 1.87 ± 0.16 in 2008 to 1.41 ± 0.117 in 2014 (t test, P = 0.016). The perpetration scores in 2014 were significantly lower than those in 2008, regardless of gender, age, university faculty, and participation in lectures/seminars about domestic violence (DV) and/or dating DV (P = 0.030).Conclusions: Findings showed reductions in some types of harassment, as well as in perpetration scores, between 2008 and 2014 among Japanese university freshmen at the same university. However, further study is required to determine the factors related to the perpetration of harassment.