A grafted seedling producing device including a stock seedling holding unit (73L) that holds and conveys a stock seedling, a stock cutting unit (76L) that cuts the stock seedling held by the stock seedling holding unit (73L), and a joining unit (75) that joins the stock seedling conveyed by the stock seedling holding unit (73L) and a scion seedling, the stock cutting unit (76L) including a stock cutter unit (23L) that includes a stock blade (31L) for cutting the stock seedling by a predetermined stock cutter trajectory (C), the stock seedling holding unit (73L) holding an embryonic stem (S) of a seedling for grafting at a predetermined position on the stock cutter trajectory (C) in a vertical posture, the grafted seedling producing device includes: a supporting unit (24L) configured to retract the stock cutter unit (23L) from an advance position for cutting in proximity to the stock seedling holding unit (73L); and a stock pressing member (32L) that presses and fixes a portion ahead of a cutting position of t
