A 3D image display device is provided. The 3D image display device can sense a posture change of a 3D display using a gyro-sensor and prevent an image for an LE and an image for an RE from being converted using a sensed posture change. The 3D image display device includes a main body a multi-view type display, a gyro-sensor, and an image-conversion controller. The multi-view type display provides a 3D image for an LE and a 3D image for an RE. The gyro-sensor is mounted in the main body to sense a posture change of the display and the image-conversion controller prevents conversion of a provided 3D image using the posture change of the display sensed by the gyro-sensor. Therefore, an image signal for an RE and an image signal for an LE are provided to viewing regions where an RE and an LE of a viewer are located, so that the viewer can view a 3D image properly.