The purpose of this study is to examine the structure of experience and participation experience of jailer participating in sensitivity training group counseling program by using phenomenological research method among qualitative research methods. For this study, five jailer were selected as research participants for in-depth interview and the collected data were analyzed based on the seven step procedure presented by Colaizzi (1978). The results of the analysis, 87 themes, 16 theme clusters and 6 categories were derived. The results of the study are as follows. First, The contents of experience of sensitivity training group counseling of jailer are as follows: ‘life as a jailer’, ‘adaptation process of ‘sensitivity training of jailer’, ‘change of perspective’, ‘change of mind and body’, ‘change of attitude and role as a jailer’, ‘improvement of quality of life’. Second, the structure of participation experience of sensitivity group counseling of jailers was revealed that ‘life as a jailer’ affects ‘the process of adapting the sensitivity training of the jailer’, ‘the process of adapting the sensitivity training of the jailer’ and ‘change of mind and body’. ‘Change of perspective and change of mind and body’ have an effect on ‘attitude and role change as a jailer’ and ‘improvement of quality of life’. Also, ‘change of perspective’ and ‘change of mind and body’ interacted with each other, and ‘improvement of quality of life’ and ‘attitude and role change as a jailer’ were found to interact with each other. And the theme clusters included in each category are interactively connected and influencing each other. This study is expected that it will be helpful for developing counseling program to achieve their goal of correction and will be basic data for development of counseling program for emotional stability by finding out the structure of participant experience and participation experience of jailers who participated in sensitivity training group counseling program.