The Ministry of the Interior comprises the following four departments: the Police Department, the Department for Rescue Services, the Migration Department and the Border Guard Department.

The Police Department is responsible for the strategic guidance and supervision of the police. The Department for Rescue Services directs and monitors rescue services. The Border Guard Department constitutes the national headquarters for the Border Guard, and the Migration Department is responsible for the performance guidance of the Finnish Immigration Service.

The units reporting directly to the Permanent Secretary are the Administration Unit, Finance Unit, Legal Affairs Unit, Internal Audit Unit, Press and Communications Services, International Affairs Unit and the Internal Security Secretariat. These units form the Ministry's Advisory Staff.

The Administration Unit is responsible for the performance guidance of the ICT Service Centre (Haltik).