| 摘要 |
A worm reduction gear includes a bias member (60) that biases a second end of a worm shaft (18) in such a direction that the second end approaches a worm wheel (19). A guide member (50) that guides movement of the second end is held in a holding hole (44) in a housing. The holding hole has an opening at an end of the housing. The guide member includes a ring portion (51) fitted in the holding hole to guide movement of the second end and a closing portion (52) that closes an end of the ring portion and thus an opening of the holding hole. |
