An improved apparatus is provided for use in a vehicular suspension arm. A through-hole is formed in one end of the suspension arm, and a bearing fits centrally in the through-hole. A pair of cylindrical spacer members are inserted into the opposed ends of the through-hole. Annular sealing members are interposed between the cylindrical spacer members and the through-hole. One end of the suspension arm is installed to the frame by means of a bolt inserted through the bearing and the cylindrical spacer members. At one end of each cylindrical spacer member, there is integrally molded a flange portion, having a larger outer diameter than the inner diameter of the through-hole. Using the described apparatus, it is possible to substantially prevent water splash, earth and sand from directly contacting the sealing member, in order to reduce the possibility of contamination.