To provide a rice planting machine that is suppressed in the length along the width direction of a vehicle body, and includes a preliminary seedling supply device.SOLUTION: A rice planting machine 1 includes: a seedling planting device 5 having a seedling placing platform 30 for sliding and moving over a first width along the width direction of a vehicle body； a preliminary seedling supply device 40 provided in a second narrower than a first width, capable of reserving seedling mats, and having a transfer unit 41 capable of switching between a first control condition for conveying the seedling mats reserved to a supply position C supplied to the seedling placing platform 30 and a second control condition for supplying the seedling mats in the supply position C to the seedling placing platform 30； and a control unit 50 for bringing the transfer unit 41 into the second control condition when the seedling placing platform 30 where the seedling mat is supplied is in the supplied position, and bringing the transfer unit 41 into the first control condition after supplying the seedling mats to the seedling placing platform 30.SELECTED DRAWING: Figure 1【課題】車体の幅方向に沿った長さを抑制した予備苗供給装置を備えた田植機を提供する。【解決手段】田植機１は、車体の幅方向に沿った第１幅に亘ってスライド移動する苗載台３０を有する苗植付装置５と、第１幅より狭い第２幅内に設けられ、苗マットが貯留可能であって、貯留された苗マットを苗載台３０に供給する供給位置Ｃまで搬送する第１制御状態と供給位置Ｃにある苗マットを苗載台３０に供給する第２制御状態とで切り換え可能な搬送ユニット４１を有する予備苗供給装置４０と、苗マットが供給される苗載台３０が被供給位置にある場合に、搬送ユニット４１を第２制御状態にさせ、苗載台３０への苗マットの供給後、搬送ユニット４１を第１制御状態にさせる制御部５０と、を備える。【選択図】図１
