The research, which is concerned first and foremost with understanding adult English learners and learning in Japan, was preformed to illustrate the results of a case study conducted on adult English learners; white-collar workers in their 30s and 40s in a city in Japan. The paper generated four assumptions of adult English learners and examined learning from three perspectives : (1) their English learning and attitudes in schools, (2) their English learning and career and (3) the factors prompting them to continue learning.