Driving force transmitting device and vehicle seat slide device

摘要

A driving force transmitting device having a direction changing gear mechanism which transmits a rotation torque from a drive shaft (48) to a driven shaft (36) having an axis extending in a direction different from a direction of an axis of the drive shaft (48). The direction changing gear mechanism (50) includes an input gear (67) attached to the drive shaft (48) for restricting a relative rotation and engaged with an output gear (66), a gear housing (53) rotatably supporting the output gear (66) and the input gear (67) under engagement condition, wherein one of the output gear and the input gear is provided with a rotation phase adjusting portion (66d) exposed outside for adjusting a rotation phase of the output gear (66) relative to a rotation phase of the second engagement portion of the driven shaft (36) upon the output gear (66) being assembled to the driven shaft (36).