Patent ID: 8256317

Claim:
A transmission device that transmits rotation of a drive shaft to a driven shaft that has an axis extending along a direction different from the axis of the drive shaft, the device comprising: a worm gear attached to the drive shaft; a helical gear attached to the driven shaft; a holding member that has an opening on one side so as to accommodate the worm gear and the helical gear; a pair of first bearing portions integrally formed with the holding member so as to face each other along the axial direction of the drive shaft, the first bearing portions rotatably supporting both ends of the worm gear; a pair of second bearing portions integrally formed with the holding member so as to face each other along the axial direction of the driven shaft, the second bearing portions rotatably supporting both ends of the helical gear; a covering member that is attached to the holding member from the one side of the holding member thereby covering the opening of the holding member; and guide pieces that are formed on at least one of the pair of first bearing portions and the pair of second bearing portions, wherein the guide pieces guide the attachment of the covering member to the holding member, and wherein the first bearing portions each have a circular first bearing surface, which is in sliding contact with one of the ends of the worm gear, and the second bearing portions each have a circular second bearing surface, which is in sliding contact with one of the ends of the helical gear.