To provide a rice transplanter which contributes to the cost reduction and the like, of a crop space-changing device and is excellent in the rationalization of a planting timing. ! A part of the power of an engine is transmitted to a seedling-planting device through the crop space-changing device 37. The crop space-changing device 37 has a crop space case 47 independent of a travel mission case. An input shaft 48, an output shaft 49, an intermediate shaft 65, and an idling shaft 70 are arranged in the crop space case 47. The rotation of the input shaft 48 is decelerated to about a half and transmitted to the idling shaft 70 through main driving gears 63, 64 and a driven gear 71. Even when the output shaft 49 is rotated at a low speed, the input shaft 48 is rotated at a high speed. Thus, the load of the input shaft 48 per rotation is reduced. Hence, the diameter of the input shaft 48 can be thinned to contribute to the cost reduction and lightening of the device. Also, the load of the input shaft 48 is lightened to reduce the torsion, and the deviation of the locus of a planting tine is reduced to contribute to a proper planting. ! (C)2012,JPO&INPIT
