Searches are performed for resonant and non-resonant Higgs boson pair production in the $hh \rightarrow \gamma\gamma b \overline b$ final state using 20 fb$^{-1}$ of proton--proton collisions at a center-of-mass energy of 8TeV recorded with the ATLAS detector at the CERN Large Hadron Collider. A 95% confidence level upper limit on the cross section times branching ratio of non--resonant production is set at 2.2 pb, while the expected limit is 1.0 pb. The corresponding limit observed for a narrow resonance ranges between 0.8 and 3.5 pb as a function of its mass.

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