Objective: To design, implement and verify the efficacy of an original stress management education program for certified care workers that is presented in a large-scale lecture format and is based on content that promotes conceptual understanding. Method : A questionnaire survey was conducted before, immediately after and one-month after program implementation with 69 students on a 2-year care worker training course who participated in the program and 185 non-participant control subjects. Results: Two-way repeated measures and analysis of variance revealed an interaction between survey timing and program participation regarding self-efficacy. Self-efficacy increased in the participation group immediately after program implementation but this decreased to pre-participation levels one month later. Conclusion: The present findings demonstrate the efficacy of the program. However, in order to ensure that post-intervention effects become firmly established, it is necessary to develop a long-term support program to be implemented over a fixed follow-up period.