Installation structure of in-wheel motor unit

An installation structure of an in-wheel motor unit including i) a motor for driving a wheel, ii) a speed reducer configured to transmit, to the wheel, rotation of the motor while reducing a speed of the rotation, and iii) a housing in which the motor and the speed reducer are housed, the installation structure being for installing the in-wheel motor unit on a carrier which is a constituent element of a suspension apparatus and which moves upward and downward relative to a body of a vehicle, such that the housing of the in-wheel motor unit is sandwiched by and between the carrier and a bearing unit rotatably holding the wheel,

• wherein the bearing unit and the housing of the in-wheel motor unit are fastened at a plurality of first fastening positions, and the carrier and the housing of the in-wheel motor are fastened at a plurality of second fastening positions the number of which is the same as the number of the plurality of first fastening positions,
• wherein each of the plurality of first fastening positions and a corresponding one of the plurality of second fastening positions form a pair, so as to provide a plurality of fastening-position pairs, and
• wherein the first fastening position and the second fastening position of each of the plurality of fastening-position pairs are located at the same position or located close to each other when viewed in a wheel axis direction, the wheel axis direction being a direction in which a rotation axis of the wheel extends.