To provide a tool divider of a machine tool capable of preventing any effect on the machining accuracy caused by the thermal displacement by removing heat generation from a rotating mechanism.

In this tool divider of the machine tool in which a tool rest body 27 with a tool T1 fitted thereto is supported by a support base 25 via a worm mechanism (rotating mechanism) 34 in a dividing manner to the predetermined angular position, cooling fluid distribution passages 48, 49 and 50 are formed so as to surround a storage recess 25a with the worm mechanism 34 stored in the support base 25 and an insertion hole 25b, and cooling fluid is fed to the cooling fluid distribution passages 48-50.