Abstract: [Problem] The present invention provides an adapter with concealing portion at a bucket tip end having an existing adapter function in this type of adapters, that is, a function as an adapter tool when a tooth board or a point is attached to a bucket tip end portion, and if being used as an adapter when the tooth board is attached to the bucket tip end portion, by being configured to cover/conceal the bucket tip end portion (edge portion), abrasion at the bucket tip end portion is drastically reduced and a life of the bucket itself is drastically extended and thus, a replacement period/replacement work of a bucket can be drastically extended and as a result, cost reduction of this type of working machines can be realized.