Aim: This study aimed to investigate the effects of public lectures on participants' disaster prevention consciousness, healthcare behavior, and disaster prevention measures. Methods: This study surveyed 42 participants (M age = 72.4, SD = 11.9) who attended a public lecture on disaster prevention regarding changes in disaster prevention consciousness, healthcare behavior, and disaster prevention measures post lecture using a self-administered, unscored questionnaire. The t-test, Wilcoxon test for disaster prevention consciousness, and the McNemar test for healthcare behavior and disaster prevention measures were conducted on the questionnaire results. Results: The participants' disaster prevention consciousness score before the public lecture was 81.7 (SD = 10.2), which was high. There were no significant differences in "Disaster Prevention Consciousness," "Healthcare Behavior," and "Disaster Prevention Measures" factors before and after the lecture. However, of the five factors of disaster prevention consciousness, "Sense of Crisis for Current Situation" significantly increased ( p = .03) after the lecture. Conclusions: Although disaster prevention consciousness did not increase before and after the public lecture education, it stimulated a "Sense of Crisis for Current Situation," leading to the maintenance of disaster prevention consciousness. For the participants who had high disaster prevention consciousness, there was no change in their healthcare behavior and disaster prevention measures, suggesting the need to consider further educational methods.