Mobile element device (13) extending in a given plane comprising at least a first (3), a second (10) and a third (12) layer lying in planes parallel to the given plane, the first layer ( 3) forming a support, the second layer (10) comprising all or part of the movable element (13) and suspension means (11) of the movable element (13) relative to the support and the third layer (12). ) comprising all or part of the capacitive means whose capacitance varies as a function of the relative position of the movable element (13) relative to the support (3), said capacitive means comprising at least one movable electrode (14) integral with a faces of the movable element (13) parallel to the given plane, and at least one fixed electrode (16) relative to the support (3), the fixed and mobile electrodes being arranged at least partly in the same plane parallel to the plane given and at least partly above and / or below the mobile element (13).
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