it is a male of Chrysis subsinuata Marquet, 1879 In Spain there's a subspecies: C. subsinuata unifasciata Hoffer, 1935, but I cannot confirm it from the picture. I think that subsinuata is a complex of different species.
Thanks a lot Paolo! I have photographed some others specimens which I thought that they could be Chrysis subsinuata, but they look like different. These are too difficult to me!