A movement amplifying actuation device, characterized in that it comprises: - a first beam comprising a piezoelectric element, adapted to flex about a principal axis when a voltage is applied to it and adapted to be attached at a first end to a first fixed point; - a second beam comprising a piezoelectric element, adapted to flex about said principal axis when a voltage is applied to it, and having a first end and a second end; - a first articulation comprising: a first portion flexible about an axis perpendicular to the principal axis and connected to the first beam at the second end of said first beam, a second portion flexible about an axis perpendicular to the principal axis and connected to the second beam at the first end of said second beam, a first rigid portion connecting the first and second flexible portions (131a, 131b), a second rigid portion adapted to be positioned against a second fixed point, a third portion flexible about an axis perpendicular to the principal axis connecting the second beam to the second rigid portion at a pivot point of said second beam so that the assembly formed by the second rigid portion and the second beam forms a lever about said pivot point, said flexible portions (131a, 131b, 131c) and rigid portions (131d, 131e) being parts of a one-piece component. - a first beam comprising a piezoelectric element, adapted to flex about a principal axis when a voltage is applied to it and adapted to be attached at a first end to a first fixed point; - a second beam comprising a piezoelectric element, adapted to flex about said principal axis when a voltage is applied to it, and having a first end and a second end; - a first articulation comprising: a first portion flexible about an axis perpendicular to the principal axis and connected to the first beam at the second end of said first beam, a second portion flexible about an axis perpendicular to the principal axis and connected to the second beam at the first end of said second beam, a first rigid portion connecting the first and second flexible portions (131a, 131b), a second rigid portion adapted to be positioned against a second fixed point, a third portion flexible about an axis perpendicular to the principal axis connecting the second beam to the second rigid portion at a pivot point of said second beam so that the assembly formed by the second rigid portion and the second beam forms a lever about said pivot point, said flexible portions (131a, 131b, 131c) and rigid portions (131d, 131e) being parts of a one-piece component. a first portion flexible about an axis perpendicular to the principal axis and connected to the first beam at the second end of said first beam, a second portion flexible about an axis perpendicular to the principal axis and connected to the second beam at the first end of said second beam, a first rigid portion connecting the first and second flexible portions (131a, 131b), a second rigid portion adapted to be positioned against a second fixed point, a third portion flexible about an axis perpendicular to the principal axis connecting the second beam to the second rigid portion at a pivot point of said second beam so that the assembly formed by the second rigid portion and the second beam forms a lever about said pivot point,