This study investigated the relationships between motivation to lead (MTL), motivation to develop leadership (MTDL), and leaders' self-development (SDL) based on a survey of 102 workers. The results showed that workers' MTL positively impacted their MTDL and SDL. Additionally, the relationship between MTL and SDL was mediated by MTDL. In other words, high MTL led to greater MTDL, which then facilitated higher SDL. The study provides suggestions for selecting manager candidates and directions for future research.