Abstract: This study investigated the influence of job type (line or staff) on perceptions of management‐by‐objectives (MBO) effectiveness, goal commitment, and goal‐attainment behavior, as well as mediating effects of perceptions of MBO effectiveness and goal commitment and moderating effects of supervisor behavior. Participants were 152 employees of a factory that manufactures drugs for a Japanese pharmaceutical company. The primary duties of line personnel involved production. The duties of staff personnel who supported production included supplying materials and production planning. Results indicated that line personnel perceived MBO as a more effective system for improving individual performance and showed higher goal commitment and more active behavior related to goals than staff personnel. Although perception of MBO effectiveness was related to goal commitment, it had no mediating effect. Goal commitment mediated between job type and goal‐attainment behavior. Supervisors’ goal‐setting behavior had different positive effects on goal commitment and goal‐attainment behavior for those in line and staff positions. MBO was a better fit for line positions than staff positions. However, supervisor behavior increased goal‐attainment behavior in staff positions. The results indicated that it is important for supervisors in a business organization to operate a management system flexibly.