Abstract: An intraocular surgery instrument holder (1) including a translational driving unit (2) as a driving mechanism configured to be capable of movement with multiple degrees of freedom, an arm unit (3) as a passive motion mechanism coupled with the translational driving unit (2) and configured to be capable of movement with multiple degrees of freedom, and a surgical instrument holding unit (4) as a passive gimbal mechanism coupled with one end of the arm unit (3), and configured to hold an intraocular surgery instrument, and to be capable of movement with a degree of rotational freedom with an opening part of a hole in an eyeball for insertion of the intraocular surgery instrument being a fixed point. A brake mechanism for inhibiting movement of the arm unit (3) is provided to the arm unit (3).