A cable anchoring device which is coupled to a bracket may be provided that includes: a cap which includes an insertion portion including a thin portion and a thick portion which are integrally formed with each other; a groove socket which includes an insertion groove into which the insertion portion is inserted and a bracket anchoring part in which a bracket anchoring groove in which the bracket is anchored is formed; and a pressing member which presses such that the thick portion is located in the bracket anchoring groove.