  We report the structural, magnetic properties, and magnetocaloric effect of a
new polycrystalline compound of $\mathrm{Tb_2Rh_3Ge}$. This present compound
crystallizes with $\mathrm{Mg_2Ni_3Si}$-type of rhombohedral Laves phases
(space group $R\overline{3}m$, hR18). The magnetic properties and
magnetocaloric effect of the $\mathrm{Tb_2Rh_3Ge}$ is explored through
dc-magnetization measurements. Temperature dependence of magnetization revealed
that the compound exhibits ferromagnetic behavior with $T_C$$=$56 K. The field
dependence of magnetization indicates that $\mathrm{Tb_2Rh_3Ge}$ is a soft
ferromagnet. The obtained isothermal magnetic entropy changes ($\Delta S_m$),
and refrigeration capacity (relative power cooling) for a change of magnetic
field 0-9 T are 12.74 J/kg-K, and 497(680) J/kg respectively. The Arrott plots
and universal curve of normalized $\Delta S_m$ indicate that this compound
undergoes second order ferromagnetic phase transition
