PROBLEM TO BE SOLVED: To provide a working machine shifting device for a rice transplanter, which can contribute to the control of the position of planted seedling.SOLUTION: A working machine shifting device for a rice transplanter comprises an inter-seedling shifting device having a clutch and disposed midway of a power transmission between an input shaft (131) and a plantation output shaft (134). The inter-seeding shifting device switches power transmission routes between a constant velocity and an inconstant velocity.COPYRIGHT: (C)2014,JPO&INPIT【課題】植付けた苗の姿勢の統制に寄与し得る田植機の作業機変速装置を提供する。【解決手段】田植機の作業機変速装置において、入力軸(131)と、植付出力軸(134)との動力伝達途中に、クラッチを有する株間変速機構を備え、株間変速機構によって等速と不等速との動力伝達経路を切り替える。【選択図】図6