[en] The magnetic properties of Ca₃FeRhO₆, which is isostructural with the rhombohedral K₄CdCl₆-type structure, were investigated by magnetic susceptibility and high-field magnetization measurements using field-oriented samples and ⁵⁷Fe Moessbauer spectroscopy using a powder sample. We observed anisotropy in the magnetic susceptibility below 12 K and the spin-flop transition in the magnetization curve at 4.2 K. The ⁵⁷Fe Moessbauer spectra show that the Fe ions occupy the trigonal prism site in the trivalent state with the high-spin configuration. It has been confirmed from our investigations that Ca₃FeRhO₆ orders below 12 K antiferromagnetically with the strong magnetic anisotropy along the c-axis. The quantitative analysis suggests that the Rh ions occupy the trigonal prism site partially in place of the Fe ions