Many tasks at a HR Department such as payroll, employee management, and maintenance of company regulations ensure that employees can work without any worries. If any of these tasks is not taken care, it might shake the foundation of that company.
A majority of this kind of tasks are clerical work and at the same time, there are many tasks that require a specialized knowledge such as laws and regulations. Due to this nature of tasks, each task is often attached to a specific person. A cost of HR Dept. is often said to increase because they have to hire a specialized person.
The need to focus on a core task of HR Dept. including "to think and make a judgement" is increasing. By using outside services, streamlining tasks and decreasing a burden on HR Dept. personnel can be achieved.
Please note that all the services are only offered in Japan.