The first isolable Ge-5-spiropentadiene 1 was synthesized via the reduction of ((PrSi)-Pr-i-Si-3)(NGeCl)-N-2 (3) with potassium. The crystal structure of 1 reveals a spirocyclic Ge-5 skeleton containing two Ge-Ge double bonds (avg. 2.34 angstrom), which are fettered in two Ge3 rings with a dihedral angle of 70.193 degrees. The DFT calculations and orbital analysis show that the sigma-delocalization of the Ge-5 skeleton and the 2 pi-delocalized aromatic Ge-3 rings enhance the stability of molecule 1.