The present invention relates to a mower comprising: a frame unit； a caterpillar unit including two driving wheels disposed on both sides of the frame unit, two driven wheels disposed on the both sides of the frame unit, and a pair of caterpillars coupled to the driving and driven wheels respectively disposed on the same side as that of the frame unit in order to interlock with rotary motion of the driving and driven wheels to be rolled and moved； a driving wheel driving unit including a battery installed to be supported to the frame unit, a pair of driving wheel driving motors, and a button to operate each rotary motion of the pair of driving wheels, and transferring rotary force of the driving wheel driving motor to the driving wheels corresponding to an operation state of the button； a circular balancing rotor disposed to surround the caterpillar in a position lower than a top of the caterpillar； a circular blade rotor disposed to surround the caterpillar in a position lower than the top of the caterpillar and higher than the balancing rotor, and form a concentric circle with the balancing rotor； a cutting blade installed in the blade rotor to perform cutting when the blade rotor is rotated； and a rotor driving unit including a rotor driving engine installed to be supported to the frame unit on an upper side of the blade rotor, and an electric rotor driving unit transferring rotary force of the rotor driving engine to the blade rotor and the balancing rotor to allow the blade rotor and the balancing rotor to be rotated in a direction opposite to each other. Accordingly, possibility to be turned over during weeding is able to be reduced.본 발명은 예초기에 관한 것으로서, 프레임부와； 상기 프레임부의 양 쪽에 각각 하나씩 배치된 2개의 동륜(動輪)과, 상기 프레임부의 양 쪽에 각각 하나씩 배치된 2개의 종륜(從輪)과, 상기 동륜과 상기 종륜의 회전동작에 연동하여 구름이동할 수 있도록 상기 프레임부의 같은 쪽에 배치된 동륜과 종륜에 하나씩 결합된 한 쌍의 무한궤도를 갖는 무한궤도부와； 상기 프레임부에 지지되도록 설치된 배터리 및 한 쌍의 동륜구동모터와 상기 한 쌍의 동륜 각각의 회전동작을 조작하기 위한 버튼을 가지고, 상기 버튼의 조작상태에 대응하여 상기 동륜구동모터의 회전력을 상기 동륜에 전달하는 동륜구동부와； 상기 무한궤
