The ¹H- and ¹³C-NMR spectra of trimethyl (1-indenyl) germanium (IV) and dimethylbis (1-indenyl) germanium (IV) compounds were measured. Assignments of the chemical shifts for ¹H and ¹³C in those compounds were obtained by means of hydrogen-hydrogen nuclear Overhauser effect spectroscopy (H-H NOESY), hydrogen-hydrogen correlation spectroscopy (H-H COSY) and carbon-hydrogen correlation spectroscopy (C-H COSY). The methyl proton and carbon signals for two stereoisomers (R,R and R,S) in the dimethylbis (1-indenyl) germanium (IV) compound were separated into three signals, with a relative signal intensity of 1 : 2 : 1; the other protons and carbons were separated, except for H₁, H₄, C₅, C₉, into two signals. These results were considered to show that the separated signals were caused by being magnetically nonequivalent in the two stereoisomers.