Individuals are increasingly required to take more responsibility for their own retirement. The purpose of this study was to investigate the efficacy of counseling for retirement planning on awareness and behavior related to retirement preparation. The data came from 3,561 adults who received counseling from National Pension Service. The major findings can be summarized as follows : (1) There were significant changes in awareness and behavior for retirement preparation after receiving counseling services ; (2) young age, type of counseling (comprehensive diagnostics for retirement preparation), and counseling method (face-to-face) had a positive effect on changes in awareness and behavior ; and (3) expertise and adequacy of counseling, as well as the attitude of counselors, had an influence on changes in awareness and behavior.