In order to support concept-creation, the authors focus on handwriting assuming that it should contain the information on the process toward insight. As a result of intensive analysis of handwriting in concept creation process, one observation is that pen speed gets faster on insight after the period in which pen speed is relatively slow or time gaps get increased. Another observation is that pen pressure gets higher on insight after the same kind of period as above. Based on those observations, the authors derive a hypothesis on relationship between insight process and handwriting. In some situations, they could create new concepts by getting aware of inconsistency or constraints, by making their viewpoint changed, and then by getting an insight. The authors think those processes can be visualized through handwriting by monitoring some features like writing speed and pressure, and this could be effective support for concept creation.