PROBLEM TO BE SOLVED: To provide a work vehicle capable of performing a work of replenishing a spare seedling frame more easily than before. A traveling vehicle body 2, a planting device 200 that is connected to a rear portion of the traveling vehicle body 2 and takes out pot seedlings from a seedling tray 50 in which pot seedlings are arranged and that is planted in a field, are provided on the traveling vehicle body 2. A replenishment seedling placing frame 150 for placing the seedling tray 50, a replenishing posture to be taken when replenishing the seedling tray 50, and a work posture to be taken when performing the planting work. Based on a predetermined signal, a command is issued to the rotation motor 610 of the switching mechanism 600 to switch the posture of the replenishment seedling mounting frame 150 between the replenishment posture and the work posture. The riding rice transplanter 1 is provided with a control unit 500 for switching to one of the postures. [Selection diagram] Figure 4【課題】予備苗枠への補充作業を従来よりも容易に行うことが出来る作業車両を提供すること。【解決手段】走行車体２と、走行車体２の後部に連結され、ポット苗が配置された苗トレイ５０からポット苗を取り出して圃場に植え付ける植付装置２００と、走行車体２に設けられた、苗トレイ５０を載置するための補給用苗載枠１５０と、補給用苗載枠１５０を、苗トレイ５０の補充を行う際にとる補充姿勢と、植付作業を行う際にとる作業姿勢との何れか一方の姿勢に切り替える切替機構６００と、所定の信号に基づいて、切替機構６００の回動モータ６１０に指令を出して、補給用苗載枠１５０の姿勢を、補充姿勢及び作業姿勢の何れか一方の姿勢に切り替えさせる制御部５００と、を備えたことを特徴とする乗用田植機１である。【選択図】図４
