  ScFe$_6$Ge$_4$ with the LiFe$_6$Ge$_4$-type structure (space group
$R{\bar{3}}m$), which has a double-layered kagome lattice (18$h$ site) of Fe
crystallographically equivalent to that of a well-known topological ferromagnet
Fe$_3$Sn$_2$, is newly found to be antiferromagnetic (AFM) with a high N\'eel
temperature of $T_{\rm{N}} \approx 650$ K, in contrast to the ferromagnetic
(FM) ground state previously proposed in a literature. $^{45}$Sc nuclear
magnetic resonance experiment revealed the absence of a hyperfine field at the
Sc site, providing microscopic evidence for the AFM state and indicating AFM
coupling between the bilayer kagome blocks. The stability of the AFM structure
under the assumption of FM intra-bilayer coupling is verified by DFT
calculations.
