Many Hong Kong-Chinese parents are active in their support for their children's music training. To better understand this support, the Parental Involvement in Music Training Questionnaire (PIMTQ) is designed to measure the variability in parental involvement in their children's music training. This study begins by exploring the factor structure of the PIMTQ and then establishes its measurement properties using Rasch modelling. Two hundred and ninety-five Hong Kong-Chinese parents completed a Chinese version of the 42-item instrument with principal components analysis of the responses showing seven factors. However, Rasch modelling showed that two of the five factors ("Family Music Background" and "Family Music Interest") are unable to reliably predict variability in parent responses. We conclude, however, that the remaining five factors ("Parental Support Toward Music Training," "Parental Expectations," "Home Music Environment," "Music Programme Support" and "Attitude Toward Music") of the PIMTQ can be used as subscales to measure the involvement of Hong Kong-Chinese parents in their children's music training.