The present invention provides a bonded tungsten carbide-based super hard alloy assembly equipped with a first metal member comprised of a steel material having a martensite structure, and defining a first bonding surface and a second metal member comprised of a tungsten carbide-based super hard alloy and defining a second bonding surface directly bonded to the first bonding surface of the first metal member. The martensite structure-containing steel material constituting the first metal member is a stainless steel having an average carbon concentration of 0.10 to 0.40 mass %. The first metal member has a high carbon concentration region at a depth ranging from 0.70 to 3.00 mm from the first bonding surface. The high carbon concentration region has a maximum carbon concentration of 0.3 to 1.2 mass %.