Sensory experience plays a crucial role in stabilizing and maintaining precise neuronal circuits. However, its molecular mechanism remains poorly understood. Recently, we discovered that the expression of type 1 metabotropic glutamate receptor (mGluR1) in the mouse dorsal lateral geniculate nucleus (dLGN) increased dramatically after the eye opening (P14~). Thus, we hypothesized that mGluR1 was involved in visual experience-dependent maintenance of the retinogeniculate (RG) synapse. We found that the developmental strengthening and elimination of RG synapses in mGluR1-KO mice were completed normally by the third postnatal week, indicating that mGluR1 is not involved in the initial phase of RG synaptic development. However, during the subsequent visual experience-dependent maintenance phase (P20~), RG synaptic innervations became aberrant in both mGluR1-KO mice and wild type mice whose mGluR1 was blocked in dLGN even under normal visual experience: weak RG synaptic fibers were newly recruited onto a single thalamic neuron. This phenomenon closely resembles the synaptic remodeling of RG fibers driven by the late visual deprivation from P20 to P28. Most notably, we found that this visual deprivation-mediated remodeling did not take a place in mGluR1-KO mice. These results suggest that mGluR1 in dLGN stabilizes once established RG synapses in a visual experience-dependent manner.