A microsystem made in a flat substrate for measuring a rotation rate according to axis perpendicular to the substrate and comprising: - at least two oscillating masses (2a, 2b), suspended with respect to the substrate by at least one pair of elastic suspension means (3a, 3b) fixed to anchoring points (4a, 4b), the at least two oscillating masses (2a, 2b) defining at least two excitation frames (6a, 6b) each surrounding a movable electrode (8a, 8b), each movable electrode (8a, 8b) being connected to the associated excitation frame (6a, 6b) by elastic return springs (10a, 10b) to be movable with respect to the associated excitation frame (6a, 6b) along a first direction (Oy), - excitation means of the at least two oscillating masses (2a, 2b) configured to apply an excitation force along a predetermined excitation direction (Ox), the excitation means being disposed along opposite first sides of the at least two excitation frames (6a, 6b) along the predetermined excitation direction (Ox), the first direction (Oy) being perpendicular to the predetermined excitation direction (Ox) and the directions (Ox) and (Oy) being parallel to the plane of the substrate, - and means for coupling the at least two adjacent oscillating masses (2a, 2b), capable of producing a movement in phase opposition of said at least two oscillating masses (2a, 2b), when they are excited in a predetermined excitation direction (Ox), microsystem characterized in that: - the at least one pair of elastic suspension means (3a, 3b) comprises two pairs of elastic suspension means (3a, 3b) arranged on each opposite sides (7a, 7b) of two adjacent excitation frames (6a, 6b) of the at least two excitation frames (6a, 6b) and having an axis of least stiffness oriented in said excitation direction (Ox), the opposite sides facing each other et being opposite along the excitation direction (Ox), - said coupling means have at least one rigid coupling bar connecting intermediate zones of said two pairs of elastic suspension means (3a, 3b) arranged between said at least two oscillating masses (2a, 2b), - each intermediate zone is arranged between a first end of the associated elastic suspension means (3a, 3b) fixed onto the corresponding excitation frame (6a, 6b), and a second end of the associated elastic suspension means (3a, 3b) fixed onto the substrate by a corresponding anchoring point (4a, 4b), - said intermediate zones, connected by the coupling means, are arranged on each side of an axis parallel to the excitation direction (Ox). - at least two oscillating masses (2a, 2b), suspended with respect to the substrate by at least one pair of elastic suspension means (3a, 3b) fixed to anchoring points (4a, 4b), the at least two oscillating masses (2a, 2b) defining at least two excitation frames (6a, 6b) each surrounding a movable electrode (8a, 8b), each movable electrode (8a, 8b) being connected to the associated excitation frame (6a, 6b) by elastic return springs (10a, 10b) to be movable with respect to the associated excitation frame (6a, 6b) along a first direction (Oy), - excitation means of the at least two oscillating masses (2a, 2b) configured to apply an excitation force along a predetermined excitation direction (Ox), the excitation means being disposed along opposite first sides of the at least two excitation frames (6a, 6b) along the predetermined excitation direction (Ox), the first direction (Oy) being perpendicular to the predetermined excitation direction (Ox) and the directions (Ox) and (Oy) being parallel to the plane of the substrate, - and means for coupling the at least two adjacent oscillating masses (2a, 2b), capable of producing a movement in phase opposition of said at least two oscillating masses (2a, 2b), when they are excited in a predetermined excitation direction (Ox), - the at least one pair of elastic suspension means (3a, 3b) comprises two pairs of elastic suspension means (3a, 3b) arranged on each opposite sides (7a, 7b) of two adjacent excitation frames (6a, 6b) of the at least two excitation frames (6a, 6b) and having an axis of least stiffness oriented in said excitation direction (Ox), the opposite sides facing each other et being opposite along the excitation direction (Ox), - said coupling means have at least one rigid coupling bar connecting intermediate zones of said two pairs of elastic suspension means (3a, 3b) arranged between said at least two oscillating masses (2a, 2b), - each intermediate zone is arranged between a first end of the associated elastic suspension means (3a, 3b) fixed onto the corresponding excitation frame (6a, 6b), and a second end of the associated elastic suspension means (3a, 3b) fixed onto the substrate by a corresponding anchoring point (4a, 4b), - said intermediate zones, connected by the coupling means, are arranged on each side of an axis parallel to the excitation direction (Ox).