PROBLEM TO BE SOLVED: To solve a problem that on protruding a seedling box stopper of a seedling transplanter to the upper surface of a supplemental seedling box-receiving stage, it tends to interfere the loading of the seedling boxes.SOLUTION: This supplementary seedling box-receiving device is constituted by installing the seedling box stopper 3 for locking the movement of the seedling box 2 at the one end edge part of the seedling box-receiving stage 1, so as retreating by resisting to a spring 4 by the loading and supplying the seedling box 2. On loading the prescribed seedling box on the upper surface of each seedling box-receiving stand 1 in advance for performing the seedling transplanting work of the seedling transplanter, by pushing the supplying end of the seedling box 2 to the seedling box stopper 3, the stopper 3 protruding to the upper surface part of the seedling box-receiving stand 1 by resisting the force of the spring 4 retreats thereby and guides for moving the seedling box 2 to the deep position of the seedling box-receiving stand 1. After loading the seedling box 2 on the upper surface of the seedling box-receiving stand 1, the seedling box stopper 3 is returned to be protruded by the spring force 4, and locks the one side end of the housed seedling box 2 for preventing the falling off movement of the seedling box 2 even if the machine body is inclined widely.COPYRIGHT: (C)2009,JPO&INPIT【課題】 苗植機の苗箱ストッパーを補助苗箱受台上面に突出させると、苗箱を搭載するとき邪魔になり易い。【解決手段】 苗箱受台1の一端縁部に、苗箱2の移動を係止する苗箱ストッパー3を、この苗箱2の搭載供給によりスプリング4に抗して退避可能に設けた構成とする。苗植機の苗植作業を行うために予め所定の苗箱を各苗箱受台1上面に搭載するとき、この苗箱2の供給端を苗箱ストッパー3に押し当てると、これによってスプリング4力に抗して苗箱受台1上面部に突出していたストッパー3が退避して、苗箱2を苗箱受台1奥深くの位置へ移動案内する。この苗箱2を苗箱受台1上面に載置すると、苗箱ストッパー3がスプリング4力によって復帰突出されて、収容苗箱2の一側端を係止して、車体が大きく傾斜してもこの苗箱2の脱落移動を防止する。【選択図】 図1