PROBLEM TO BE SOLVED: To provide an auxiliary step structure of a work vehicle capable of suppressing damaging of an auxiliary step and efficiently carrying out door open viewing work while omitting the time and labor of switching the position of the auxiliary step.SOLUTION: An auxiliary step structure of a work vehicle includes a door interlocking mechanism 17 for switching between the use attitude of projecting an auxiliary step 1 to the outside of a machine body by interlocking with the movement of a door 10 provided at the entrance 13 of a cabin B covering an operation part 2 to its opening position and the storage attitude of retreating the auxiliary step 1 into the machine body by interlocking with the movement of the door 10 to its closing position. The operation part 2 includes a member interlocking switching mechanism 19 having a switching member 18 capable of freely switching the auxiliary step 1 projected to the use attitude following the movement of the door 10 to the opening position to the storage attitude while keeping the open position of the door 10.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2016,JPO&INPIT【課題】補助ステップの位置切り換え操作の手間を省きながら、補助ステップの破損を抑制すると共に、ドア開放覗き作業を能率よく行うことができる作業車両の補助ステップ構造を提供する。【解決手段】操縦部2を覆うキャビンBの乗降口13に設けるドア10の開放位置への移動に連動して、補助ステップ1を機体外側に突出させる使用姿勢と、ドア10の閉鎖位置への移動に連動して補助ステップ1を機体内側に退避させる格納姿勢とに切り換えるドア連動機構17を備える作業車両の補助ステップ構造であって、前記操縦部2に、ドア10の開放位置への移動に伴い使用姿勢に突出される補助ステップ1を、ドア10の開放位置を保持したまま格納姿勢に切り換え操作自在な切換部材18を有する部材連動切換機構19を設ける。【選択図】図3
