  Temperature dependence of the $^{115}$In-NMR spectra of CeRhIn$_5$ is studied
with the external magnetic fields 10$^\circ$ off the [100] and [001] axes. Our
detailed analyses confirm that the AFM3 phase breaks the four-fold spin
symmetry with the commensurate ordering vector of $Q = (0.5, 0.5,0.25)$. Based
on the observation of anistropic hyperfine fields, we also propose the symmetry
lowering of the electronic structure in the AFM3 phase.
