The purpose of this study was to investigate the developmental process of career adaptability. Measurement of career adaptability was attempted for 2040 corporate employees (from 20 years old to 60 years old, 1138 men and 902 women). The developmental process of career adaptability was examined based on age and self- recognition of career stage. Results revealed a difference in age in "Confidence factors" and "Control factors" of career adaptability. They also confirmed that career adaptability has an important function in the "search stage" and the "transitional stage" of a career.