A disposable device configured for simultaneously performing a plurality of identical, preferably biological, experiments in fluid samples carried out according to a set of steps, characterized in that said device comprises a plurality of stacked components having a flat configuration: - a microfluidic chip comprising: ∘ a flat-plate support (3.1) comprising microfluidic chambers and microfluidic channels in bas-relief, both adapted to form complete or partially complete elemental devices which allow carrying out the steps of each experiment, ∘ an elastically deformable sheet (3.2) adapted to cover partially complete elemental devices; wherein the elemental devices which are associated with each of the experiments or groups of said elemental devices are distributed according to a specific forward movement direction X-X' and form an independent row, the forward movement direction X-X' being the direction that is followed to perform the set of steps forming the complete experiment; and wherein the microfluidic chip comprises a first face on its flat-plate support and a second face, opposite the first face, on its elastically deformable sheet (3.2); wherein this microfluidic chip has fluidic inlets (4.2) and/or fluidic outlets (4.3) on the first face, and has interaction regions for interaction with external actuating means on the second face, - a flat part adapted to be coupled on the first face of the microfluidic chip, wherein the flat part comprises at least one fluidic connection element (4.1) on a first face, the first face of the flat part being the face opposite a second face of the flat part, the second face of the flat part being the face adapted to be coupled to the microfluidic chip, said fluidic connection elements (4.1) being distributed in rows according to direction X-X' and in columns according to the direction transverse to direction X-X'; and wherein each of the fluidic inlets (4.2) and/or fluidic outlets (4.3) of the microfluidic chip coincides with and is fluidically connected to a fluidic connection element (4.1) through the flat part, wherein at least one column of fluidic connection elements (4.1) comprises, in each of said fluidic connection elements (4.1), a variable-capacity container adapted to change its capacity through impelling means (1.1), the variable-capacity container being fluidically communicated with the fluidic connection element (4.1); and the second face of the microfluidic chip comprises, preceding each fluidic connection element (4.1) having a variable-capacity container according to the forward movement direction X-X', a valve located in an interaction region and adapted to block the backward movement of the fluid in the direction opposite the forward movement direction X-X' when the variable-capacity container is impelled to reduce its capacity. - a microfluidic chip comprising: ∘ a flat-plate support (3.1) comprising microfluidic chambers and microfluidic channels in bas-relief, both adapted to form complete or partially complete elemental devices which allow carrying out the steps of each experiment, ∘ an elastically deformable sheet (3.2) adapted to cover partially complete elemental devices; wherein the elemental devices which are associated with each of the experiments or groups of said elemental devices are distributed according to a specific forward movement direction X-X' and form an independent row, the forward movement direction X-X' being the direction that is followed to perform the set of steps forming the complete experiment; and wherein the microfluidic chip comprises a first face on its flat-plate support and a second face, opposite the first face, on its elastically deformable sheet (3.2); wherein this microfluidic chip has fluidic inlets (4.2) and/or fluidic outlets (4.3) on the first face, and has interaction regions for interaction with external actuating means on the second face, ∘ a flat-plate support (3.1) comprising microfluidic chambers and microfluidic channels in bas-relief, both adapted to form complete or partially complete elemental devices which allow carrying out the steps of each experiment, ∘ an elastically deformable sheet (3.2) adapted to cover partially complete elemental devices; - a flat part adapted to be coupled on the first face of the microfluidic chip, wherein the flat part comprises at least one fluidic connection element (4.1) on a first face, the first face of the flat part being the face opposite a second face of the flat part, the second face of the flat part being the face adapted to be coupled to the microfluidic chip, said fluidic connection elements (4.1) being distributed in rows according to direction X-X' and in columns according to the direction transverse to direction X-X'; and wherein each of the fluidic inlets (4.2) and/or fluidic outlets (4.3) of the microfluidic chip coincides with and is fluidically connected to a fluidic connection element (4.1) through the flat part,