Motivation affects interpreting training outcomes, but so far no validated motivation scale for interpreting learning is available in the literature. Applying insights from the learning motivation research in the fields of education and psychology to interpreting training, this study develops an interpreting learning motivation scale which includes four dimensions, namely intrinsic motivation, instrumental motivation, performance goals and intended efforts. The data analysis results show that the motivation scale has a fairly high level of internal consistency and test-retest correlation co-efficiency, and it can significantly predict learners' performance in an interpreting test. When pitted against the selfefficacy scale and the interpreting anxiety scale, the motivation scale demonstrates both convergent validity and divergent validity. Taken together, the interpreting learning motivation scale is validated as an effective tool for measuring interpreting learning motivations.