PROBLEM TO BE SOLVED: To solve a problem that a multiple row-planting type seedling planter is difficult to maintain the balance of right and left weights, because a transmission system for transmitting a power to each planting row seedling planter is wide in the lateral direction, and a problem that the multiple row-planting type seedling planter is also difficult to place a leveling plane in the right and left directions on a horizontal plane on right and left planting rows, and uniformly maintain planting depths, because the rolling action of the seedling planter is maldistributed, when the weight is unevenly distributed in the right and left directions. SOLUTION: This seedling-planting transmission system of the seedling planter is characterized by pivotally mounting an input shaft 3 and a lateral transmission shaft 4 transmitted from the input shaft 3 on the front portion of a center case 2 placed at the seedling-planting lateral central portion of a seedling-planting transmission case 1, pivotally mounting a planting shaft 6 transmitted from the lateral transmission shaft 4 through a longitudinal transmission mechanism 5 on the rear portion, disposing a levee clutch 7 on the lateral transmission shaft 4 and a safety clutch 8 on the planting shaft 6 on either of the right and left sides of the longitudinal transmission mechanism 5, and disposing a cam shaft transmission mechanism 11 for driving a cam shaft 10 for laterally moving a seedling tank 9 from the lateral transmission shaft 4, and a cam shaft transmission case 12, on the opposite side. COPYRIGHT: (C)2006,JPO&NCIPI