Reflecting film excellent in cohesion resistance and sulfur resistance

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A reflecting film including : an Ag or Ag-base alloy thin film of an Ag-base alloy containing at least one element among Au, Pt, Pd, Bi, and rare-earth elements as a first layer; a film of an oxide or oxynitride of at least one element among Si, Al and Ti having a thickness between 5 and 50 nm as a second layer deposited on the first layer; and a film having a thickness between 10 and 100 nm formed by a plasma polymerization process as a third layer deposited on the second layer.