The invention provides a radio frequency unit including a box-shaped chassis into which an insulating board loaded with electronic components is housed, and two connectors attached to a front plate of the chassis with a space therebetween. A supporting member protruding into the chassis is provided in a position between the two connectors in the front plate. The supporting member has a flat plate portion that is bent at right angles from an end face of the front plate, and extends parallel to the insulating board, and a pair of tongue pieces that are formed so as to be bent towards the inside of the chassis from both side ends of the flat plate portion. The pair of tongue pieces are located in a cutout portion provided in the insulating board, and the tongue pieces are soldered to a grounding pattern provided in the insulating board.