Disclosed is a seedling transplanter with enhanced planting accuracy. The seedling transplanter comprises a travel device, a seed transportation part to transport seeds, and a seed planting device (6) to plant the seeds in farm, wherein the seeds are transported to the planting supply position by the seed transportation part. The seed planting device (6) is configured to have a seed planting holding tool (31) for holding the seeds at the planting supply position operate along a long path back and forth to plant the seeds in farm. A transmission switch mechanism (87) is configured to switch between a uniform speed transmission state and a non-uniform speed transmission state on the transmission path to the seed planting device (6). Comparing with the uniform speed transmission state, while the seed being planted and inserted into the soil by the seed planting device (6), the inserted depth is deeper under the non-uniform speed transmission state.本發明的課題係提高栽種精度。本發明為一種苗移植機，係具備有：行駛裝置；苗搬送部，用以搬送苗；以及苗栽種裝置(6)，將由苗搬送部搬送到栽種供給位置的苗栽種在農田中；苗栽種裝置(6)係夾持栽種供給位置的苗的苗栽種夾持工具(31)在前後較長的軌跡上作動而將苗栽種在農田；設置可切換為在朝苗栽種裝置(6)的傳動路徑上以等速傳動的等速傳動狀態與以不等速傳動的不等速傳動狀態的傳動切換機構(87)，相較於等速傳動狀態，在不等速傳動狀態下利用苗栽種裝置(6)朝土壤插入的苗的插入長度較長。
