A seedling planting device has a front side seat part (93F) and a rear side seat part (93R) separately carried and placed on a front side part and a rear side part in an upper end face (U) of a main frame (15) on a joining seat part (93) of a feed box (16). A gap (101) for insertion and conduction of an electric wire (100) of an upper end face side of the main frame (15) along transverse wiring of a machine body is formed between the front side seat part (93F) and the rear side seat part (93R). An interval of lower end sides of the front side seat part (93F) and the rear side seat part (93F) is larger than an interval of upper end sides. In the seedling planting device provided by the invention, the feed box with the joining seat part joined to the upper end face of the main frame in a fastened manner, the electric wire is arranged on the upper end face side of the main frame, and even if in a position supporting the feed box, the electric wire is not exposed from the main frame and can be easily arranged.
