The present invention provides a root canal treatment apparatus in which biting of a blade of a cutting tool into a root canal wall can be released and push-back of shavings into a root canal can be suppressed, when a position of a tip end of the cutting tool reaches a predetermined set position and rotation of the cutting tool is stopped. The root canal treatment apparatus according to the present invention includes: a handpiece configured to hold a cutting tool in a head in a drivable manner； a motor driver and a micromotor configured to drive the cutting tool； a root canal length measurement circuit； and a control portion. The root canal length measurement circuit is configured to electrically detect a position of a tip end of the cutting tool in a root canal, using the cutting tool as a measuring electrode. The control portion is configured to perform drive for reversely rotating the cutting tool by a predetermined set angle (180 degrees) when the position of the tip end of the cutting tool detected by the root canal length measurement circuit reaches a predetermined set position, and then, stopping rotation.
