To provide a seedling transplanter that allows reduction in the frequency and time of seedling supply to improve work efficiency.SOLUTION: A seedling transplanter comprises: a plurality of preliminary seedling mounting members (38a, 38b, 38c) for mounting a seedling box (68) or a seedling on a support machine frame (49) provided on a travel vehicle (2)； and a preliminary seedling frame (38) to which a plurality of movement link members (39a, 39b, 39c) for rotatably coupling the plurality of preliminary seedling mounting members (38a, 38b, 38c) are attached which is configured to, by rotation of the plurality of the movement link members (39a, 39b, 39c), switch between a development state in which the plurality of preliminary seedling mounting members (38a, 38b, 38c) are arranged in a cross direction and a stacked state in which the plurality of preliminary seedling mounting members (38a, 38b, 38c) are arranged in a vertical direction. The preliminary seedling frame (38) is provided above a steering part (33) for operating the machine body.SELECTED DRAWING: Figure 2【課題】苗補給の回数や時間削減になり、作業効率が上がる。苗移植機を目的とする。【解決手段】走行車体（２）に設けた支持機枠（４９）に苗箱（６８）又は苗を載置する複数の予備苗載せ部材（３８ａ，３８ｂ，３８ｃ）と前記複数の予備苗載せ部材（３８ａ，３８ｂ，３８ｃ）をそれぞれ回動自在に連結する複数の移動リンク部材（３９ａ，３９ｂ，３９ｃ）を取り付け、該複数の移動リンク部材（３９ａ，３９ｂ，３９ｃ）の回動により複数の予備苗載せ部材（３８ａ，３８ｂ，３８ｃ）が前後方向に並ぶ展開状態と複数の予備苗載せ部材（３８ａ，３８ｂ，３８ｃ）が上下方向に並ぶ積層状態に切り替え自在に構成した予備苗枠（３８）を備える苗移植機において、前記予備苗枠（３８）は機体を操作する操縦部（３３）の上方に設けたことを特徴とする。【選択図】図２
