Provided are magnetic particles of a novel structure and a process for producing the magnetic particles. Also provided is a medicinal preparation of a novel structure, the preparation including the magnetic particles. The magnetic-particle-including medicinal preparation (7) comprises: magnetic particles (1) that are hollow inside and comprise a magnetic cage-shaped skeleton which consists of a sintered object obtained from metallic nanoparticles including nanoparticles comprising any of Fe, Co, and Ni and in which the porosity obtained by projecting the sintered object on a two-dimensional plane, processing the projected image in terms of transmission electron microscope image, and determining the proportion of the transparent parts to the whole area inside the contour of the sintered object is 1-50% and a coating layer (40) with which at least some of the surface layer of each magnetic particle (1) is coated. The medicinal preparation contains a drug (30) within the magnetic cage-shaped skeleton (10) and/or in the coating layer (40).
