A sliding mechanism comprises a sleeve member, two balls in the sleeve member, and an elastic member biased between the balls for urging each ball to project above either opening of the sleeve member. When the sliding mechanism is mounted on a second member, a reduction of friction and a permanent contact between the first and second members are effected because the second member is slidable with respect to a first member with balls being in elastic contact with the first member. This may reduce friction and maintain a permanent contact when first and second members are relatively moving.