A polyaxial bone anchoring device is provided comprising a bone anchoring element having a shank to be anchored in a bone and a head； a receiving part coupled to the shank and configured to pivotably receive the head, and having a channel for receiving a rod and a longitudinal axis； a pressure member configured to be positioned in the receiving part； a locking member insertable into the channel； wherein the pressure member has a deformable portion； and wherein, when the locking member is advanced into the channel in the direction of the longitudinal axis, the locking member in moveable from a position where it contacts the pressure member resulting in a load applied to the pressure member that clamps the head, to a position where the locking member contacts the pressure member such that the deformable portion is deformed and the locking member contacts the rod and clamps the rod.
