In order to examine the properties of fatigue crack initiation and propagation from weld cracks which were created at high temperature and also to make clear the influence of weld crack angle on the above mentioned properties, fatigue tests were performed on the specimens containing the weld cracks of various orientations. The material used was JIS SM50A steel. Weldings were done by submerged arc processes or metal-inert-gas arc processes. The specimens were bending-type which contained cracks on the edge, and tension-type which possessed cracks on the center. The angles between crack orientations and applied stress direction were 90, 60, 30 degrees in the bending-type specimens, and were 90, 60, 45 degrees in the tension-type specimens.