In a hard material made stopper housing case to house a plurality of cylindrical stoppers for defining a drill blade entering depth of a dental implant fixture embedding hole at a jawbone when performing a dental implant treatment, the stopper has a spring-like locking part to be locked with a flange part projected from a shank part of a drill, the stopper housing case 1 has concave parts 2 provided in parallel and capable of respectively housing the stopper Y, and each of the concave parts 2 includes, at one side, a flange part insertion path 3 having a size preventing the spring-like locking part from falling out and being capable of inserting the flange part, and further includes, at another side opposite to the one side, a drill blade part insertion path 4 capable of inserting the blade part of the drill X.