To improve the installation workability of a wear sheet for constituting a contact surface to a leaf spring.
The slope with the same direction and same angle running along the axis direction of a rear axle housing 4 for the receiving surface 4a formed on the upper surface of the rear axle housing is given to the lower surface of an installation flange 5a formed on the front/rear both ends of the wear sheet 5 for forming the contact surface to a leaf spring installed on a car body side and the upper surface of a tightening flange 4b projected and formed to the front/rear walls of the rear axle housing 4. By constituting at least one side of the bolt hole formed on the installation flange 5a or the bolt hole formed on the tightening flange 4b by a long hole running along the axis direction of the rear axle housing 4, the proper contact of the wear sheet 5 and the rear axle housing 4 can be obtained by only moving the wear sheet 5 in the axis direction of the rear axle housing 4.
KAWAUCHI RYUTARO