Nondestructive inspection (NDI) is important to ensure the safety of structures such as power plants, vehicles and infrastructures. Ultrasound is one of the NDI techniques majorly used. Our group has already proposed a ultrasound generation laser scanning system for visualizing ultrasound waves propagating on any shape as an animation image, where flaw can be quickly and easily detected. Recently, we have focused on making the system completely contact-free by applying an air-coupled ultrasound transducer as a receiver, instead of a contact piezo-electric receiver. An advantage of the contact-free receiver is that it makes it easy to move the sensing point, and, as a consequence, images from different points of view can be obtained. Reductions of the effects of surface conditions of specimens and contact situations of the receiver are also advantages of the contact-free receiver. Improvements on noise reduction, higher sensitivity, and signal processing are now in progress aiming at more clear and speedy visualization.