<p>The objective of the present study was to develop a Japanese version of the Interpersonal Behaviours Questionnaire (IBQ-J) and evaluate its validity. The IBQ is a scale for assessing the perceptions of interpersonal behaviours of others and is based on Self-Determination Theory within the context of need-supportive and needthwarting behaviours. In Study 1, participants reported the interpersonal behaviours of people in their lives. In Study 2, participants reported the interpersonal behaviours of specified significant people (namely, parents and intimate friends). The results of the two studies were largely consistent with the previous Self-Determination Theory studies. We concluded that the IBQ-J is a valid scale for investigating the perceptions of need-supportive, and need-thwarting behaviours of others.</p>