The authors investigated a guitar lesson development class in a science university with a wrist-worn motion sensing system in addition to conventional apparatus such as musical instruments and sound recorders in a music class. 15 undergraduate students in computer science school participated a 5-hour-long project-based learning class held for 14 weeks. Each student used the motion sensing device and a laptop PC to determine analysis results for their guitar strumming motion. By concentrating on an accented strumming technique from both artistic and scientific points of view, the guitar lesson development class found that the artistic impression and the human motion science would share creative ideas in a project-based STEAM education.