PROBLEM TO BE SOLVED: To provide a work machine that not only can turn in a small radius but also easily make a course adjustment even when travelling with either one of a front part and a rear part of a travelling machine body being positioned at a front side in an advancing direction, and further can move from a working/travelling region already worked to the next working/travelling region by short distance travel.SOLUTION: The work machine, equipped with a steering operation device 10 that controls a front wheel steering actuator 54 and a rear wheel steering actuator 56 and operates steering of a pair of left and right front wheels 2 and a pair of left and right rear wheels 3, can control the front wheel steering actuator 54 and the rear wheel steering actuator 56, in each of a front wheel steering control mode for steering only the front wheels 2, a rear wheel steering control mode for steering only the rear wheels 3, both wheels same-steering direction control mode for steering the front wheels 2 and the rear wheels 3 in the same steering direction and both wheel opposite steering direction control mode for steering the front wheels 2 and the rear wheels 3 in opposite directions.COPYRIGHT: (C)2015,JPO&INPIT【課題】小回り旋回ができるのみならず、走行機体の前部及び後部のいずれを進行方向前側にして走行する際でも進路調整を行ない易く、かつ、作業済みの作業走行域から次の作業走行域への移動を短距離走行で行える作業機を提供する。【解決手段】前輪操向アクチュエータ54及び後輪操向アクチュエータ56を制御し、左右一対の前車輪2及び左右一対の後車輪3を操向操作する操向操作装置10を備えてある。前車輪2のみを操向させる前輪操向制御モード、後車輪3のみを操向させる後輪操向制御モード、前車輪2及び後車輪3を同操向方向に操向させる両輪同操向制御モード、及び、前車輪2及び後車輪3を逆操向方向に操向させる両輪逆操向制御モードのそれぞれにおいて、前輪操向アクチュエータ54及び後輪操向アクチュエータ56を制御できる。【選択図】図16
