A bone fixing device includes a tubular member that has an end having an inside surface defining a constraint section. A fixing member has opposite ends respectively forming a movable joint section that is receivingly engageable with the constraint section and a threaded section that is attachable to a bone or a retention section that is snap-fit over a bone. The movable joint section forms a constraint face corresponding to the constraint section. The constraint section and the constraint face collectively constrain a swing direction of the fixing member. The movable joint section has a top end with which a constraint member is abuttingly engageable. Further, the tubular member forms an elongate constraint slot in a portion adjacent to the constraint section for constraining swing angle of the fixing member. The constraint slot has a length that is proportional to the swing angle of the fixing member.
