In this study, we clarified the characteristics of job satisfaction by occupation and age group based on the survey (n = 2,318) of building construction business sector of the Japanese general contractor. And we also classified them into five groups based on the characteristics of their response tendencies by cluster analysis and discussed the characteristics and improvement measures for each group. Finally, a structural model of the formative factors of employee engagement is presented by structural equation modeling. After clarifying these issues, we examined job satisfaction and employee engagement enhancement.