PROBLEM TO BE SOLVED: To provide a seedling transplanter capable of planting a desired number of seedling mats in a desired field. SOLUTION: When a single seedling mat is placed on the upper side from the lower end of the placement surface of a seedling placing table, a downstream sensor provided at a position that can be detected in conjunction with the vertical feeding of the seedling mat by a vertical feeding mechanism. When the seedling mat is placed above the lower end of the placement surface at a position larger than the vertical length of at least one seedling mat above the seedling mat and above the downstream sensor, An upstream sensor provided at a position that can be detected in conjunction with the vertical feed is provided, and the feed amount of the seedling mat is calculated based on the detection information of the upstream sensor and the downstream sensor. [Selection diagram] Fig. 13【課題】所望の圃場に対して所望の苗マット数で植付を行うことができる苗移植機を提供する。【解決手段】苗載台の載置面の下端から上方側に苗マットを一枚置いたときに、縦送り機構による苗マットの縦送りに連動して検知可能な位置に設けられる下流側センサと、載置面の下端から上方側に少なくとも苗マット一枚の上下長さよりも大きい間隔を空けた位置、かつ、下流側センサの上方側に苗マットを一枚置いたときに、苗マットの縦送りに連動して検知可能な位置に設けられる上流側センサと、を設け、上流側センサと下流側センサの検知情報に基づいて、苗マットの送り量を算定する。【選択図】図１３
