Disclosed is an electronic component case which includes a case body in which a rotationally engaging boss and a rotation prevention protrusion are disposed; and a bracket having a bracket body and an engaging portion formed at an end portion of the bracket body, wherein the engaging portion includes a rotationally engaging hole aligned with the rotationally engaging boss and a rotation prevention portion formed to be spaced apart from the rotationally engaging hole to form a contacting surface that is caught by the rotation prevention protrusion, and provides an advantageous effect of preventing the bracket from rotating in a process of tightening a screw to the bracket.