Varmt välkommen! And you have here a good example how this site works ;-)... One comment follows the other, good ones and bad ones, like mine. I think Stephen is correct with his suggestion. I notice now the stronger "tail" (which looks like being the ovipostor) in yours. So try to check the Siricidae. Thanks, Stephen for the correction and do not forget to add some links :-)!
http://en.wikipedia.org/wiki/Horntail
Looks like being an Ichneumonidae, an extremely widespread and abundant family. There are hundreds of different species around. Can't help you more.
http://en.wikipedia.org/wiki/Ichneumonidae
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