The process for manufacturing a photovoltaic concentrator comprising a photovoltaic substrate (2) equipped with a plurality of photovoltaic cells (5), and an optical structure (1) comprising a first optical-lens stage (4) and a second optical-lens stage (3) that are intended to optically interact with each other, includes (i) providing a mould (6); and (ii) simultaneously forming the first optical-lens stage (4) and the second optical-lens stage (3) using said provided mould (6), and implementing a step of filling said mould (6) with a material (100), especially by injecting or pouring said material (100).