PROBLEM TO BE SOLVED: To provide a seedling-planting mechanism of a rice transplanter, which can easily perform maintenance work for a seedling pushing tool.SOLUTION: There is provided a seedling-planting mechanism of a rice transplanter, in which a seedling pushing tool 31 for pushing seedlings from a seedling-planting tine 8 is supported on a planting tine-supporting case 10 slidably in a state projecting outward from the inside of the planting tine-supporting case 10 for supporting the seedling-planting tine 8, a moving operation mechanism 32 for moving the seedling pushing tool 31 to an action position or a non-action position accompanied by the seedling-planting movement operation of the planting tine-supporting case 10 is disposed in the inside of the planting tine-supporting case 10, the seedling pushing tool 31 has a sliding member 29 slidably supported on a sliding support portion 33 formed in a planting tine-supporting case 10, and a push member 34 is attachably and detachably attached to the sliding member 29 to perform a pushing out action on the seedlings.COPYRIGHT: (C)2014,JPO&INPIT【課題】苗押し出し具についてのメンテナンス作業が行い易いものとなる田植機の苗植付機構を提供する。【解決手段】苗植付爪8から苗を押し出す苗押し出し具31が、苗植付爪8を支持する植付爪支持ケース10の内部から外方に突出する状態で且つ摺動自在に植付爪支持ケース10に支持され、植付爪支持ケース10の苗植え用の移動操作に伴って苗押し出し具31を作用位置と非作用位置とに移動させる移動操作機構32が、植付爪支持ケース10の内部に備えられ、苗押し出し具31が、植付爪支持ケース10に形成された摺動支持部33にて摺動自在に支持される摺動部材29と、その摺動部材29に着脱自在に取り付けられて苗に対して押し出し作用する押し出し部材34とを備えて構成されている。【選択図】図3