A vibration inhibiting mechanism for a scanner including a base installed in a chassis of the scanner for resiliently biasing a roller support formed with a roller assembling portion on the top thereof; a roller being mounted on the roller assembling portion for abutting against a glass panel disposed on a top side of casing for receiving the chassis by an upward urging force exerted by the roller support, so as to prevent the chassis from vibrating along a direction perpendicular to the glass panel during the movement of the chassis and to prevent damage to or dislocation of the chassis during a drop test.