Supporting part on one bone cement stirring machine, including a rotation drive device, and at least one setting what rotation drive device. The rotation drive device includes the master gear of the setting what rotation drive device, and one drives through a motor and with the swivel mount that the master gear pivots about, and at least one engage the master gear linked gear group. The supporting part includes to be driven in the setting what linked gear group and by it accommodation groove for carrying out Stirring stroke, one setting what accommodation groove and the movable positioning seat for being detached from the what accommodation groove, the accommodation groove includes the first limiting section at least one setting what accommodation groove inner wall, which includes the second limiting section of at least one opposite what first limiting section to fix the positioning seat what accommodation groove.一骨水泥攪拌機，包括一旋轉驅動裝置，以及至少一設置於該旋轉驅動裝置上的承載部。該旋轉驅動裝置包括有一設置於該旋轉驅動裝置的主齒輪，一透過一馬達驅動並以該主齒輪為中心進行旋轉的旋轉架，以及至少一嚙合該主齒輪的連動齒輪組。該承載部包括有一設置於該連動齒輪組上並受其帶動進行旋轉攪拌行程的容置槽，一設置於該容置槽並可活動脫離於該容置槽的定位座，該容置槽包含有至少一設置於該容置槽內壁面上的第一限位部，該定位座包含有至少一相對於該第一限位部的第二限位部以固定該定位座於該容置槽。
