Fatigue strength and propagation characteristics of ceramic/metal joints were investigated under cyclic bending loading. Fracture surfaces were examined by SEM and X-ray methods. Fatigue fracture occurred at the metal/interlayer interface as well as the ceramic/interlayer interface. Fatigue strength was independent of the fracture path. Fatigue crack initiate and grow on the ceramic/interlayer interface at the specimen corner. Under constant amplitude cyclic loading, the fatigue crack decelerated and finally halted. As a result of the increasing amplitude of cyclic loading, the final fracture occurred at the metal/interlayer interface. Even under cyclic compressive loading, fatigue cracks were initiated on the ceramic/interlayer interface. This study looks at the method to evaluate the fracture mechanics parameter for interface cracks on ceramic/metal joints.