TOOL MANAGEMENT SYSTEM OF MACHINE TOOL

A tool management system of a machine tool capable of determining an appropriate time to replace a tool used by a machine tool is provided. The tool management system includes: at least one detectionunit among: a vibration detection unit attached to a spindle that supports a tool of a machine tool to detect vibration; a sound detection unit provided in the vicinity of the spindle to detect acoustic waves produced during operation of the machine tool; and a servo motor current value detection unit that detects a current value of a servo motor of a driving device of the machine tool; a tool replacement determination unit that determines the necessity to replace the tool on the basis of information related to a detection value of at least one of the vibration, the acoustic waves, and the current value detected during operation of the machine tool; and a detection start/end command setting unit that adds commands for a detection start point and a detection end point of at least one of thevibration, the acoustic w