The mass of the neutrino is one of the last missing pieces of the standard model of particle physics. While experiments measuring the neutrino oscillation between their flavour states can put tight constraints on the squared mass differences (Super Kamiokande, SNO, T2K...), other laboratory experiments performing kinetic measure of the neutrino mass (KATRIN) are still struggling to improve the constraints on the absolute scale of the neutrino masses. On the other hand as the universe is filled with cosmological neutrino and because neutrino have non zero, but tiny, mass, they participate to the evolution of cold dark matter density perturbations at the origin of the Large Scale Structure. In consequence, the estimation of statistics in the LSS such as the power spectrum, allow cosmologist to have an indirect constraint on the sum of the 3 neutrino mass which is 10 times better than the one from direct kinetic measurements. Future large scale survey of the sky like Euclid will potentially bring the finest measure of the total neutrino mass, allowing to distinguish between the normal and inverted mass hierarchy.