A power transmission joint (40) of a hand-held powered working machine (1) comprises a joint sleeve having, on a front side thereof, a power input fitting portion (41a) or a power input engaging shaft portion (44,45a) co-rotatably engaged with a power input end portion (27b) of a working device (10) and also having, on a rear side thereof, an insert fitting portion (41b) into which an insert (42) is fitted and embedded. The insert (42) has a drive shaft fitting portion (42b) co-rotatably engaged with a drive front end portion (50a) of a drive shaft (50) of an operation lever or pipe (3). This allows the drive front end portion (50a) of the drive shaft (50) and the power input end portion (27b) of the working device (10) to co-rotatably engage with each other, even if the drive front end portion (50a) and the power input end portion (27b) have different or non-matching shapes to prevent direct rotational engagement with each other, making it possible to reduce the purchase cost for replacement and the burden of storage space.
