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See translations here, and in particular his June 1905 paper:Poincare proposed all fundamental laws are Lorentz-invariant? In what paper? If true, that would seem to make Poincare the real originator of what we know today as special relativity, even if Einstein grounded the idea more in physical arguments involving rulers and clocks (and perhaps even if Poincare did come up with Lorentz-invariance, he may not have realized various implications such as differential aging and E=mc^2)

http://en.wikisource.org/wiki/Author:Henri_Poincaré

Note also his earlier paper on clocks and measurements.