PROBLEM TO BE SOLVED: To provide a riding type rice transplanter which receives preliminary mat-like seedlings on both the lateral sides of a self-propelled vehicle in a state arranged in the longitudinal direction of the vehicle body, and facilitates all of travel, getting-on and -off, and seedling supply.SOLUTION: Provided is the riding type rice transplanter having preliminary seedling-loading tables 50 for loading and receiving a plurality of preliminary mat-like seedlings in a state arranged in the longitudinal direction of the vehicle body and a support 30 for supporting the preliminary seedling-loading tables 50 on both the lateral sides of the self-propelled vehicle and slidably supporting the preliminary seedling-loading tables 50 so that the whole bodies of the preliminary seedling-loading tables 50 slide in the longitudinal direction of the vehicle body, and forming the support so that the preliminary seedling-loading tables 50 are arranged at lower positions than the upper end of a steering handle 4 and so that the upper ends of the support 30 is placed at a lower position than the highest ends of the preliminary seedling-loading tables 50.COPYRIGHT: (C)2009,JPO&INPIT【課題】 自走車の横一側部に予備マット状苗を車体前後方向に並べて収容する乗用型田植機でありながら、走行、乗り降り、苗補給のいずれもが行いやすくする。【解決手段】 複数枚の予備マット状苗を車体前後方向に並べて載置収容する予備苗載せ台50と、予備苗載せ台50を自走車の横一側部に位置させて支持し、かつ予備苗載せ台50の全体が車体前後方向にスライド移動するよう予備苗載せ台50をスライド操作自在に支持する支持体30とを備えてある。予備苗載せ台50をステアリングハンドル4の上端よりも低い配置高さに位置させるように、かつ支持体30の上端が予備苗載せ台50の最上端部の配置高さ以下の配置高さに位置するように支持体を構成してある。【選択図】 図1