A tilt preventing structure for electromagnetic driving device comprises: a casing, a driven object (such as lens module), a guiding mechanism and an electromagnetic driving module. The driven object is received within the casing and is movable along an axial direction. The guiding mechanism is furnished inside the casing and is sleeved with the driven object, so as to guide the driven object to move along the axial direction. The electromagnetic driving module comprises a plurality of magnetic elements mounted on the driven object. The guiding mechanism is made of magnetically susceptible material and is nearby one of the magnetic elements. By means of the magnetic pulling force generated by the nearby magnetic elements, the guiding mechanism is pulled by the force and leans against the driven object, so as to minimize the tilts when the driven object is moving relative to the guiding mechanism.