A device for shaping at least one fibrous preform for producing a bladed part of a turbomachine, this device including a mould formed by several parts that are interlocked with each other, this mould defining at least one internal cavity configured to receive the preform and to enclose said preform integrally, this cavity being intended to have two platform areas (Z2, Z3) and a blade area extending between the two platform areas, characterised in that said mould comprises at least: - a lower shell which forms a lower end of the mould and which comprises a convex curved surface of said blade area, - an upper shell which forms an upper end of the mould and which comprises a concave curved surface of said blade portion, the upper and lower shells (46, 38) being fastened to each other, defining a first side of the mould and forming therebetween a first groove for forming a trailing edge of said blade area, - a side shell which forms a second side of the mould, this second side being opposite to the first side and forming a second groove for forming a leading edge of said blade area, and - end shells (42, 44) located at two opposite ends of the mould and between which the lower, upper and side shells extend, these end shells respectively forming at least one portion of said platform areas (Z2, Z3), and in that each of the side and end (42, 44) shells comprises three elements, respectively lower (40a, 42a, 44a), intermediate (40b, 42b, 44b) and upper (40c, 42c, 44c), the elements of the side and end (42, 44) shells being independently and removably fastened so as to be able to be dismounted and removed from the mould without dismounting the upper and lower shells. characterised in that said mould comprises at least: - a lower shell which forms a lower end of the mould and which comprises a convex curved surface of said blade area, - an upper shell which forms an upper end of the mould and which comprises a concave curved surface of said blade portion, the upper and lower shells (46, 38) being fastened to each other, defining a first side of the mould and forming therebetween a first groove for forming a trailing edge of said blade area, - a side shell which forms a second side of the mould, this second side being opposite to the first side and forming a second groove for forming a leading edge of said blade area, and - end shells (42, 44) located at two opposite ends of the mould and between which the lower, upper and side shells extend, these end shells respectively forming at least one portion of said platform areas (Z2, Z3), - a lower shell which forms a lower end of the mould and which comprises a convex curved surface of said blade area, - an upper shell which forms an upper end of the mould and which comprises a concave curved surface of said blade portion, the upper and lower shells (46, 38) being fastened to each other, defining a first side of the mould and forming therebetween a first groove for forming a trailing edge of said blade area, - a side shell which forms a second side of the mould, this second side being opposite to the first side and forming a second groove for forming a leading edge of said blade area, and - end shells (42, 44) located at two opposite ends of the mould and between which the lower, upper and side shells extend, these end shells respectively forming at least one portion of said platform areas (Z2, Z3), and in that each of the side and end (42, 44) shells comprises three elements, respectively lower (40a, 42a, 44a), intermediate (40b, 42b, 44b) and upper (40c, 42c, 44c), the elements of the side and end (42, 44) shells being independently and removably fastened so as to be able to be dismounted and removed from the mould without dismounting the upper and lower shells.