Abstract: The invention relates to a blow-extruder machine possessing a frame (4) having a plane support structure (6) and supporting a wheel (10) which can rotate about its axis (12) in a vertical plane and which is equipped with moulds (14) on its periphery, the moulds being, as a function of their positions in the plane of the wheel, closed in order to create a moulding cavity (16) or open in order to receive a tubular parison (42), and an extrusion head (40) located in an area in which the opposite mould is open and intended to supply the said parison (42) according to a direction (F) which is inclined relative to the support surface (6) and downwards, the machine comprising a support (60; 70; 80) possessing a plane (P) which is inclined relative to the horizontal and which supports the support surface (6), the inclined plane (P) forming, with a horizontal plane, an acute angle (b) which is approximately equal to 90.degree.