An intelligent retractor having a mode switching lever includes: a spool around which webbing is wound; a flywheel which is provided at one side of the spool and rotates along with the rotation of the spool; a locking unit which fixes the flywheel when a predetermined condition for preventing an extension of the webbing is satisfied; and a mode switching lever which rotates in a state in which the webbing is extended by a predetermined length or greater, and operates the locking unit so that the locking unit fixes the flywheel.