PROBLEM TO BE SOLVED: To properly set a gap between a transplant tine and an opening groove when passing the opening groove of a takeout opening cover.SOLUTION: A rice transplanter 1 comprises a seedling-transplant device 23 for scratching out seedlings with a transplant tine 30 detachably attached to a tine case 236 from a seedling mat placed on a seedling-carrying platform 29 to transplant the seedlings to a farm field. A takeout opening cover 226 having an opening groove 231 passing the transplant tine 30 is detachably attached to a seedling output port 220 of a seedling output plate 131 arranged below the seedling-carrying platform 29, a set of the transplant tine 30 and the takeout opening cover 226 can be replaced with a set of a transplant tine 30a having a transplant tine width WA and a takeout opening cover 226a having an opening groove width ΔWa, or a set of a transplant tine 30b having a transplant tine width WB wider than the transplant tine width WA and a takeout opening cover 226b having an opening groove width ΔWb wider than the opening groove width ΔWa, and a gap ΔWa-WA being the difference between the transplant tine width WA and the opening groove width ΔWa is larger than a product value of a reduction ratio WA/WB and a gap ΔWb-WB being the difference between the transplant tine width WB and the opening groove width ΔWb.SELECTED DRAWING: Figure 21【課題】取出口カバーの開口溝を通過する際の植付爪と開口溝の隙間を適切に設定する。【解決手段】田植機１は、爪ケース２３６に着脱可能に取り付けた植付爪３０で苗載台２９に載置された苗マットから苗を掻き取って圃場へ植え付ける苗植付装置２３を備え、苗載台２９の下方に配置した苗取出板１３１の苗取出口２２０に、植付爪３０の通過する開口溝２３１を有する取出口カバー２２６を着脱可能に取り付け、植付爪３０と取出口カバー２２６の組を、植付爪幅ＷＡの植付爪３０ａと開口溝幅ΔＷａの取出口カバー２２６ａの組、又は、植付爪幅ＷＡよりも広い植付爪幅ＷＢを有する植付爪３０ｂと開口溝幅ΔＷａよりも広い開口溝幅ΔＷｂを有する取出口カバー２２６ｂの組に交換可能であり、植付爪幅ＷＡと開口溝幅ΔＷａの差である隙間ΔＷａ－ＷＡは、植付爪幅ＷＢと開口溝幅ΔＷｂの差である隙間ΔＷｂ－ＷＢと縮小比率ＷＡ／ＷＢとの積の値よりも大きい。【選択図】図２１
