A seeding planting device is provided with a plurality of moving rotating bodies which guide a seeding carrying platform (12) to be capable of moving to the left and right directions on a support part (68) in a state that the rotating bodies are arranged in prescribed intervals spaced by the left and right directions. The seeding carrying platform (12) in a state that the seeding carrying platform (12) is located between the left and right directions of the moving rotating bodies (75) is provided with limit parts (93). Each limit part allows left and right movements of the seeding carrying platform (12) and limits floating-up of the seeding carrying platform (12) relative to the support part (68), each limit part (93) is composed of a clamping stop part (94), and the clamping stop part extends in the upper and lower direction across the seeding carrying platform (12) and the support part (68) and limits the floating-up of the seeding carrying platform (12). Through adoption of the invention, for the structure for preventing the seeding carrying platform from floating up, improvement of durability can be obtained, and cost reduction can be obtained by utilization of structure simplification.
