The invention relates to a magnetic resonance imaging device (10) comprising a field generation unit (12) configured to provide a magnetic field in an imaging volume (30) of the magnetic resonance imaging device (10), wherein the field generation unit (12) comprises at least one magnet and wherein a surface directed towards the imaging volume (30) of the at least one magnet (13) comprises a concave shape, wherein a direction of access (16) to the imaging volume (30) is oriented essentially perpendicular to a main direction of magnetic field lines in the imaging volume (30).