A computer, comprising: a main body having an internal space and a ventilating hole; a control unit in the main body; a power supplying unit for supplying the main body with power; and a dust eliminator, the dust eliminator comprising: a heat-radiating fan provided in the internal space of the main body to form an air stream for exhausting heat in the main body to the outside; cooling means having a plurality of micro gaps formed therein such that air can pass through it, the cooling means being provided between the ventilating hole and the heat-radiating fan, the cooling means exchanging heat with the air stream passing therethrough; a vibration-generating element transmitting vibration to the cooling means to shake off dust accumulated on the cooling means; the computer further comprising a switch for selectively supplying power from the power supplying unit to the vibration-generating element according to a signal of the control unit, and characterized by: a heat pipe contacting one surface of the cooling means for transferring heat generated in a heat-generating component provided in the main body to the cooling means, wherein the vibration-generating element is in contact with one surface of the cooling means opposite to the surface thereof contacting with the heat pipe, wherein the vibration generating element is driven for a predetermined time from an initial time at which the computer is requested to be powered off, to minimize vibration transmitted to the cooling means while the user operates the computer, wherein a rotating speed of a rotating blade provided in the heat-radiating fan is at highest speed or varied while the vibration-generating element is driven. a main body having an internal space and a ventilating hole; a control unit in the main body; a power supplying unit for supplying the main body with power; and a dust eliminator, the dust eliminator comprising: a heat-radiating fan provided in the internal space of the main body to form an air stream for exhausting heat in the main body to the outside; a heat-radiating fan provided in the internal space of the main body to form an air stream for exhausting heat in the main body to the outside; cooling means having a plurality of micro gaps formed therein such that air can pass through it, the cooling means being provided between the ventilating hole and the heat-radiating fan, the cooling means exchanging heat with the air stream passing therethrough; a vibration-generating element transmitting vibration to the cooling means to shake off dust accumulated on the cooling means; the computer further comprising a switch for selectively supplying power from the power supplying unit to the vibration-generating element according to a signal of the control unit, and characterized by: a heat pipe contacting one surface of the cooling means for transferring heat generated in a heat-generating component provided in the main body to the cooling means, wherein the vibration-generating element is in contact with one surface of the cooling means opposite to the surface thereof contacting with the heat pipe, wherein the vibration generating element is driven for a predetermined time from an initial time at which the computer is requested to be powered off, to minimize vibration transmitted to the cooling means while the user operates the computer, wherein a rotating speed of a rotating blade provided in the heat-radiating fan is at highest speed or varied while the vibration-generating element is driven. a heat pipe contacting one surface of the cooling means for transferring heat generated in a heat-generating component provided in the main body to the cooling means, wherein the vibration-generating element is in contact with one surface of the cooling means opposite to the surface thereof contacting with the heat pipe, wherein the vibration generating element is driven for a predetermined time from an initial time at which the computer is requested to be powered off, to minimize vibration transmitted to the cooling means while the user operates the computer, wherein a rotating speed of a rotating blade provided in the heat-radiating fan is at highest speed or varied while the vibration-generating element is driven.