The purpose of this study was to assess the extent and intensity of conflicts in ordinary life prompted by excessive immersion for coaching and to clarify the determinant factors of this excessive immersion. A questionnaire was developed consisting of 64 statements, 10 of which were for A Scale of Excessive Immersion for Volunteer Coaching (SEIVC) in order to measure the degree of excessive immersion. The data were provided by 671 volunteer coaches in Fukuoka, Japan. Principal factor solution method with normal varimax rotation and techniques of the First Formula of Hayashi's Quantification Scaling Theory were utilized. The main results can be summarized as follows: 1) About 30% of the volunteer coaches pointed out that they faced the conflicts in ordinary life derived from coaching, such as the lack of time with their families, the frequent frictions with their regular job, and the gradual increase of personal expenditures. 2) The validity of the SEIVC was assured and it was judged that the scale was an adequate means of measuring the excessive immersion for volunteer coaching. 3) The degree of excessive immersion was found to be strongly influenced by the role-perception as a coach, by the type of volunteer, by the level of satisfaction with their coaching skills, by the coaches orientation toward winning a game, by the type of the regular job, and by the level of cooperation by family members and/or by co-workers in his/her work place. Finally, the meanings of conflicts in ordinary life from the excessive immersion for coaching were analyzed using a role cycle model. It was assumed that the establishment of adequate relations between role-expections and role-conceptions was very important to avoid the conflicts arising from excesslve immersion.