An inset type feed antenna structure is disclosed includes a substrate, a patterned conductive layer disposed on an upper surface of the substrate, and a grounding layer disposed on a lower surface of the substrate. The patterned conductive layer includes a conductive line and a plurality of radiation units, wherein each radiation units includes a conductive patch provided with a notch on one side thereof, and a feeding line electrically connecting the conductive line and the notch, wherein the feeding line is a quarter-wave feeding line. The present invention not only decreases the distance between the radiation units and the conductive line to control the vertical side lobes, but also increases the impedance of each radiation unit, so that more radiation units can be fed in.