An opening/closing mechanism for a drawer member includes a stopper member for stopping movement of the drawer member, where the position of a stopper member is variable, in the direction of movement of the drawer member, so as to adjust the degree of opening of the drawer member. Rotatable rollers are preferably provided on one of the drawer member and a housing therefore, and a stopper member provided on the other, engagable with the rollers for stopping movement of the drawer. The stopper member enables resumption of movement of the of the drawer after being stopped by the stopper member. If desired, a plurality of stopper members may be provided.