A robot cleaner comprising a cleaner main body, a wheel rotatably coupled to the cleaner main body, a tire coupled to an outer circumferential surface of the wheel, and a slide-preventing plate removable coupled to an outer circumferential surface of the tire, whereby the slide-preventing plate allows the robot cleaner to easily move without being slid so as to prevent unwanted power consumption, thereby preventing a position error caused by the sliding of the robot cleaner.