Cr–Cr 2 O 3 –Pb–Sn x O y – Pb double tunnel junctions in which inelastic tunneling processes occur, are fabricated. The change in the superconducting order parameter in the middle Pb film upon variation of the temperature, film thickness, and resistivity of the Cr2O3 layer is investigated. The results are interpreted in the framework of theoretical models developed by Kirtley, Seidel, Grajcar, and others for inelastic tunneling processes.