Lycaenidae, Polyommatinae, Polyommatus icarus. One of the most common butterflies in Europe and though sometimes tricky to ID. But I am quite confident, that these are Polyommatus icarus.
http://commons.wikimedia.org/wiki/File:Hauhechel-Bläuling,_Polyommatus_icarus_Paarung_1.JPG
http://www.natur-schmetterlinge.ch/schmetterlinge-nach-familie/lycaenidae-bläulinge/polyommatus-icarus-hauhechelbläuling/
http://www.schmetterling-raupe.de/art/icarus.htm
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