PROBLEM TO BE SOLVED: To facilitate the work for continuously feeding seed potatoes to the conveying belt in the longitudinal feeding type seed potato planting machine. SOLUTION: This relates to a longitudinal feeding type seed potato planting machine and a large number of seed potatoes S can be received on the near side of the part at the position of the worker M in the machine body 8, further on at least one side of the part of the conveying belt and the seed potatoes S feeding table T is set so that seed potatoes S may be allowed to fall down on the side of the conveying belt 14.