Polyaxial bone anchoring device, which includes an anchoring element (2) with a rod (3) to anchor it to a bone and a head (4)； a housing part (5, 5 ') with an upper end (51) and a lower end (52), a channel (56) for accommodating a rod inside and a passage (53, 54, 55) extending from the upper end (51) to the lower end (52) and including a seat (54) to accommodate the head (4)； a pressure element (6) arranged in the passage (53) and configured to exert pressure on the head (4), the pressure element being a solid element without spring parts, the head being rotatable with respect to the housing part (5) and it can be locked at an angle by means of the pressure element (6)； the pressure element (6, 6 ') comprising at least one recess (600a, 600b； 610 a, 610b； 620a, 620b) oriented towards the inner wall of the housing or a deformable part (601a', 601b ') on its outer wall； the housing part (5) including at least one deformable part (501a, 501b) located in its inner wall which, when deformed, engages the recess (600a, 600b； 610 a, 610b； 620a, 620b) of the element pressure, or including an inlet (500a ', 500b') open at least towards its inner wall； the deformable part (502a, 502b； 601a ', 601b') and the recess (600a, 600b； 610 a, 610b； 620a, 620b； 500a ', 500b') being arranged so that, by coupling the deformable part with the recess, the pressure element (6) exerts on the head a force that keeps the head in an angular position by friction before blocking it, and the deformable part (501a, 501b； 601a ', 601b') being configured to deform plastically to form a deformed part (502a, 502b； 602a ', 602b') that extends into the passage (53).Dispositivo de anclaje óseo poliaxial, que incluye un elemento de anclaje (2) con un vástago (3) para anclarlo a un hueso y una cabeza (4)； una pieza de alojamiento (5, 5') con un extremo superior (51) y un extremo inferior (52), un canal (56) para alojar una varilla en su interior y un paso (53, 54, 55) que se extiende desde el extremo superi
