Gyroscope with enhanced sensitivity

An inertial sensor comprising:

• a substrate which defines a device plane extending along a rotation direction and a drive excitation direction normal to the rotation direction,
• a first drive frame
• a second drive frame,
• an excitation device for excitating the first and the second drive frames in the drive excitation direction,
• a first proof mass hingedly connected to the first drive frame along a first connection axis directed along the rotation direction,
• a second proof mass hingedly connected to the second drive frame along a second connection axis directed along the rotation direction,
• a lever pivotably mounted around a fulcrum axis directed along the rotation direction,
• at least one strain gauge mechanically stressed by the lever when said lever is rotating around the fulcrum axis,
• wherein:
• the first proof mass is rotationally connected to the lever along a first coupling axis directed along the rotation direction,
• the second proof mass is rotationally connected to the lever along a second coupling axis directed along the rotation direction,
• the first connection axis is further away from the fulcrum axis than the first coupling axis, and
• the second connection axis is further away from the fulcrum axis than the second coupling axis.