139La-NQR measurement has been made in a superconductor La3Ir2Ge2. The spin-lattice relaxation rate 1/T1 measured in the normal state is proportional to the temperature T, indicating that La3Ir2Ge2 is a simple metal. In the superconducting state, a small coherence peak in 1/T1 appears just below the superconducting transition temperature Tc=4.7K and 1/T1 decreases exponentially well below Tc with decreasing temperatures. It is concluded that La3Ir2Ge2 is a BCS superconductor with an energy gap 2Δ(0)/kBTc=3.52.
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