[Problem] To provide an extendible working machine which is lightweight and which has a rod section capable of being extended longer.[Solution] An extendible working machine is provided with a rotation/drive section, a working section, and a rod section which connects the rotation/drive section and the working section, transmits rotational force to the working section, and can be extended and retracted. The rod section is provided with a tube body which can be extended and retracted, and also with a shaft body which extends in the axial direction within the tube body and which can be extended and retracted together with the tube body. The tube body is provided with an outer tube and with an inner tube which can move within the outer tube. The shaft body is provided with a drive shaft which is supported within the outer tube by bearings in a rotatable manner, and also with a pipe shaft which is supported within the inner tube in a rotatable manner. Helical grooves are formed in the surface of the drive shaft, and the drive shaft is connected to the pipe shaft such that the pipe shaft can move in the axial direction along the outer surface of the drive shaft and such that the rotation of the drive shaft is transmitted to the pipe shaft.Le problème décrit par la présente invention est de produire une machine de travail extensible qui est légère et qui possède une section tige pouvant s'étendre plus loin.La solution selon l'invention porte sur une machine de travail extensible dotée d'une section de rotation/entraînement, d'une section de travail et d'une section tige qui relie la section rotation/entraînement et la section travail, transmet une force de rotation à la section de travail, et peut s'étendre et se rétracter. La section tige est dotée d'un corps de tube qui peut s'étendre et se rétracter, et également d'un corps d'arbre qui s'étend dans la direction axiale dans le corps de tube et qui peut s'étendre et se rétracter avec le corps de tube. Le corps de tub
