a 42 b 42 c and 42 d are disposed so that the pressured fluid within the airtight spaces 28 will pass further the diameter dimensions of diaphragms 43 a 43 b 43 c and 43 d disposed within the directional diaphragm units 42 a 42 b 42 c and 42 d are set such that the relation u03c6 a lt u03c6b lt u03c6c lt u03c6d holds with the present embodiment the directional diaphragm units 42 a 42 b 42 c and 42 d and the mechanical valves 51 and 52 make up the fluid control unit 53 serving as the fixation force control means the operation of the surgery equipment holding device configured as described above will now be described first description will be made regarding a case of the surgeon moving the endoscope 1 in the event that the surgeon operates the mechanical switch 50 a the input port 51 a and the functioning port 51 c are placed in a communicating state at the mechanical valve 51 also in the event that the surgeon operates the mechanical switch 50 b the input port 52 a and the functioning port 52 c are placed in a communicating state at the mechanical valve 52 in the event that the surgeon operates both the mechanical switch 50 a and the mechanical switch 50 b simultaneously the pressured fluid from the fluid pressure source 15 passes through the hose 55 input port 51 a functioning port 51 c hose 56 input port 52 a and functioning port 52 c in that order and flows into the hose 57 the pressured.