This is actually not a mantis, but a magnific example of evolutive convergence. This insect is related with lacewings and ant-lions, so it's an holometabolous or "modern" insect like butterflies, flies, wasps and beetles, while mantids are hemimetabolous, more primitive, related with bugs, cicadas, grasshoppers and dragonflies.
It's called a mantidfly. They're insects belonging to the family Mantispidae. The species is Mantispa styriaca. It's the most common species of mantidfly found in Europe, and I guess that the only in France. In Spain whe have two more species, very similar, but much rarer.