A radio-frequency coil apparatus includes a first unit including a first radio-frequency coil that receives a magnetic resonance signal emitted from a subject, a second unit including a second radio-frequency coil that receives the magnetic resonance signal, independently from the first radio-frequency coil. The first unit and the second unit are supported by a support member. The support member is attachable/detachable to/from at least one of the first unit and the second unit. The support member is configured to be able to change the relative positions of the first unit and the second unit.