PURPOSE: To remove easily the splash separated from a coolant on the way of coolant collection trough of a machining center, by fitting a filter separably.

CONSTITUTION: A saddle 14 is supported movable on a rail 12 installed on a bed 10 of a machining center, in such a way as movable in the direction fore and aft. Behind a work table 18, No.1 coolant exhaust hole 24 is provided in the middle part of a No.1 coolant collection trough 20. This saddle 14 is also provided with a No.2 coolant collection trough 24 stretching in the table moving direction, and No.2 coolant exhaust hole 26 is provided at one of the ends of this trough 24. Below this exhaust hole 26, a No.3 coolant collection trough 28 is provided, and No.3 coolant exhaust hole 30 is provided at the rear end of this trough 28. A filter 34 is furnished inside this trough 28. Thus the splash separated from coolant can be removed easily.