Purpose: This study was conducted to analyze and clarify the concept of ``motivation for vocational rehabilitation in persons with mental disabilities``. Methods: A hybrid model was used to analyze the concept of motivation for vocational rehabilitation in persons with mental disabilities. The model included a comprehensive literature review and field study. Field study was conducted through in-depth interviews with 5 persons with mental disabilities who had employment experience and participant observation in rehabilitation facilities. Results: The concept of motivation for vocational rehabilitation in persons with mental disabilities was found to be a complex phenomenon having meaning in two dimensions: Goal-oriented and cognitive dimensions. Five attributes and fourteen indicators were defined. Motivation for vocational rehabilitation in these persons was defined as a recognition of the need to get a job, and the willingness and confidence to get and keep a job in order to achieve normal life, happiness, economic stability, and their value. Conclusion: The findings from this study will contribute to the development of assessment tools and nursing interventions to reinforce the motivation for vocational rehabilitation in persons with mental disabilities.