A test device according to the driving operation of the operator to simulate driving state, comprising: a base plate, which can be moved on a slipping floor in the direction of an X-axis and a Y-axis by an air bearing, and which is disposed freely and movably to be rotated around a Z-axis, the X-axis, Y-axis, and Z-axis forming a three-dimensional coordinate system, wherein the X-axis and Y-axis are substantially parallel to the slipping floor, and the Z-axis is substantially perpendicular to the slipping floor, a platform, which is connected on the base plate by a movement connecting mechanism, and in which a part to be driven is provided, wherein the base plate is connected with a movement mechanism, which can be moved on the slipping floor in the direction of the X-axis and the Y-axis, and which is disposed freely and movably to be rotated around the Z-axis, wherein the movement mechanism is connected pivotally to the base plate, such that in a top plan view, when the base plate is positioned substantially in the center of the upper surface of the slipping floor in an initial position, the central angle degree β forms 120° along a round circle C, when extension lines at tips of the movement mechanism are positioned at the initial position, they are tangent to the round circle C or form angles close to the state of being tangent to the round circle C, wherein the central angle degree β is an angle between a line from a center of the round circle C to one of the tips of the movement mechanism and a line from the center of the round circle C to another tip among the tips of the movement mechanism, characterized in that a magnetizing device, which is disposed to the lower surface of the base plate to face the slipping floor, is provided, in the operating state at a high air pressure of the air bearing, the magnetizing force to the slipping floor of the magnetizing device is in a strong state, in the non-operating state at a low air pressure of the air bearing, the magnetizing force to the slipping floor of the magnetizing device is in a weak state. a base plate, which can be moved on a slipping floor in the direction of an X-axis and a Y-axis by an air bearing, and which is disposed freely and movably to be rotated around a Z-axis, the X-axis, Y-axis, and Z-axis forming a three-dimensional coordinate system, wherein the X-axis and Y-axis are substantially parallel to the slipping floor, and the Z-axis is substantially perpendicular to the slipping floor, a platform, which is connected on the base plate by a movement connecting mechanism, and in which a part to be driven is provided, wherein the base plate is connected with a movement mechanism, which can be moved on the slipping floor in the direction of the X-axis and the Y-axis, and which is disposed freely and movably to be rotated around the Z-axis, wherein the movement mechanism is connected pivotally to the base plate, such that in a top plan view, when the base plate is positioned substantially in the center of the upper surface of the slipping floor in an initial position, the central angle degree β forms 120° along a round circle C, when extension lines at tips of the movement mechanism are positioned at the initial position, they are tangent to the round circle C or form angles close to the state of being tangent to the round circle C, wherein the central angle degree β is an angle between a line from a center of the round circle C to one of the tips of the movement mechanism and a line from the center of the round circle C to another tip among the tips of the movement mechanism, characterized in that a magnetizing device, which is disposed to the lower surface of the base plate to face the slipping floor, is provided, in the operating state at a high air pressure of the air bearing, the magnetizing force to the slipping floor of the magnetizing device is in a strong state, in the non-operating state at a low air pressure of the air bearing, the magnetizing force to the slipping floor of the magnetizing device is in a weak state.