A virtual image display device and an object selection method for virtual image thereof are provided. The object selection method for virtual image includes the following: a virtual image display is enabled to capture image information of a hand of a user; whether an image of an auxiliary tool is present in the image information is determined; position information of the auxiliary tool is generated according to the image of the auxiliary tool when the image of the auxiliary tool is present in the image information; the virtual image display is enabled to generate the position information of the auxiliary tool according to inertial measurement information of the auxiliary tool when the image of the auxiliary tool is not present in the image information; and the virtual image display is enabled to display an auxiliary indicator for selecting object according to the position information.