This paper is concerned with the development of a shock tube suited for nondestructive evaluation in concrete structures. For this purpose, a shock wave is developed from the reaction of propane-air mixtures in a long circular cylindrical tube. The propane and air mixture is injected into reaction chamber from a mixing chamber. Ignited the mixture, a detonation wave goes through into the atmosphere from the open end of the shock tube. The performance of the tube was evaluated by measuring the pressure distribution on specimen surface and experiments of defect detection for a concrete specimen. In the pressure measurement, triangular wave with a pressure of 4 kPa and duration of 0.4 ms was obtained at 500 mm distance from the shock tube. In the defect detection, we could detect a defect with a diameter of 200mm and a depth of 50mm clearly.