The purpose of the present invention is to provide a multiband antenna with an excellent effect of ensuring isolation. The present invention relates to a multiband antenna comprising: a ground plate; an inverted-F-type first radiating element formed on the ground plate; an inverted-F-type second radiating element formed with a predetermined gap in a shape symmetrical with the first radiating element; a first parasitic element formed with a predetermined gap from one end of the first radiating element and the second radiating element; and a second parasitic element formed with a predetermined gap from the other end of the first radiating element and the second radiating element.