A MEMS angular velocity sensor comprising: a first and second rotating arms, wherein the first and second rotating arms are coupled to each other and the first and second rotating arms are configured to counter rotate when driven into oscillation; at least one travelling system comprising a first travelling mass and a second travelling mass ; wherein the first travelling mass is coupled to the first rotating arm by a first flexible element and the second travelling mass is coupled to the second rotating arm by a second flexible element ; wherein first and second travelling masses are coupled to each other with a third flexible element ; and at least one actuator for driving the at least one travelling system into oscillation; characterised in that the first flexible element has a different spring stiffness value than the second flexible element, wherein a spring stiffness of the second flexible element is equal to a combined spring stiffness of the first flexible element and the third flexible element; wherein the first travelling mass is configured to move in a linear manner in only a first direction X of an X-Y plane when driven into oscillation and the second travelling mass is configured to move in the first direction X and in a second direction Y of the X-Y plane, orthogonal to the first direction X, when driven into oscillation as a result of the first flexible element having the different spring stiffness value than the second flexible element. a first and second rotating arms, wherein the first and second rotating arms are coupled to each other and the first and second rotating arms are configured to counter rotate when driven into oscillation; at least one travelling system comprising a first travelling mass and a second travelling mass ; wherein the first travelling mass is coupled to the first rotating arm by a first flexible element and the second travelling mass is coupled to the second rotating arm by a second flexible element ; wherein first and second travelling masses are coupled to each other with a third flexible element ; wherein the first travelling mass is coupled to the first rotating arm by a first flexible element and the second travelling mass is coupled to the second rotating arm by a second flexible element ; wherein first and second travelling masses are coupled to each other with a third flexible element ; and at least one actuator for driving the at least one travelling system into oscillation; characterised in that the first flexible element has a different spring stiffness value than the second flexible element, wherein a spring stiffness of the second flexible element is equal to a combined spring stiffness of the first flexible element and the third flexible element; wherein the first travelling mass is configured to move in a linear manner in only a first direction X of an X-Y plane when driven into oscillation and the second travelling mass is configured to move in the first direction X and in a second direction Y of the X-Y plane, orthogonal to the first direction X, when driven into oscillation as a result of the first flexible element having the different spring stiffness value than the second flexible element. characterised in that the first flexible element has a different spring stiffness value than the second flexible element, wherein a spring stiffness of the second flexible element is equal to a combined spring stiffness of the first flexible element and the third flexible element; wherein the first travelling mass is configured to move in a linear manner in only a first direction X of an X-Y plane when driven into oscillation and the second travelling mass is configured to move in the first direction X and in a second direction Y of the X-Y plane, orthogonal to the first direction X, when driven into oscillation as a result of the first flexible element having the different spring stiffness value than the second flexible element. <EOS>