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The present invention provides Cu-base amorphous alloys comprising an amorphous phase of 90% or more by volume fraction. The amorphous phase has a composition represented by the formula : Cu 100-a-b (Zr + Hf) a Ti b or Cu 100-a-b-c-d(Zr + Hf) a Tib Mc Td, wherein M is one or more elements selected from the group consisting of Fe, Cr, Mn, Ni, Co, Nb, Mo, W, Sn, Al, Ta and rare earth elements, T is one or more elements selected from the group consisting of Ag, Pd, Pt and Au, and a, b, c and d are atomic percentages falling within the following ranges : 5