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A flow past two side-by-side identical circular cylinders was numerically investigated with the unstructured spectral element method. From the computational results at various non-dimensional distances between cylinder centers T/D and the Reynolds number Re, a total of nine kinds of wake patts were observed: four steady wake patts, including single bluff-body steady patt, separated double-body steady patt and transition steady patt for sub-critical Reynolds numbers and biased steady patt for super-critical Reynolds numbers, and five unsteady wake patts, including single bluff-body periodic patt, biased quasi-steady patt, quasi-periodic (flip-flopping) patt, in-phase-synchronized patt and anti-phase-synchronized patt. Time evolution of lift and drag coefficients corresponding to each unsteady wake patt was given.