A polyaxial bone anchoring device is provided comprising a bone anchoring element (1) comprising a head (3) and a shank (2), the head having a portion with a greatest diameter (E)； a receiving part (5, 5', 500) for receiving a rod (100) for coupling the rod to the bone anchoring element； the receiving part (5, 5', 500) comprising a top end (5a) and a bottom end (5b), a first passage (51) coaxial with a first longitudinal axis (51a) and a second passage (56) coaxial with a second longitudinal axis (56b), wherein the first and second longitudinal axis intersect； wherein the first passage (51) includes a seat (62, 63； 92) that opens toward the bottom end (5b), the seat being configured to allow pivoting of the head relative to the seat； wherein the seat (62, 63； 92) is substantially symmetrical with respect to the pivoting of the head when the head pivots in any direction and in the respective opposite direction； and wherein the head (3) is insertable into the seat (62, 63； 92) from the bottom end.本案提供一種多軸式骨骼固定裝置，包括：骨骼固定元件(1)，包括頭部(3)和幹部(2)，頭部有一部具備最大直徑(E)；容納件(5,5',500)，供容納桿件(100)，把桿件聯結到骨骼固定元件；容納件(5,5',500)包括頂端(5a)和底端(5b)，與第一縱軸線(51a)共軸之第一通道(51)，以及與第二縱軸線(56a)共軸之第二通道(56)，其中第一和第二縱軸線交叉；其中第一通道(51)包含支座(62,63；92)，朝底端(5b)開口，支座係構成容許頭部相對於支座樞動；當頭部按任何方向和個別相反方向樞動時，支座(62,63；92)與頭部樞動實質上對稱；又其中頭部(3)可從底端插入支座(62,63；92)內。
