An apparatus and a method for connecting high-frequency circuit boards, and for providing an electrical connection between respective electrodes of two high-frequency circuit boards includes an electrode connecting member including a bar-shaped member having a predetermined sectional shape, and having connecting electrodes formed on a part of an outer periphery of the bar-shaped member. The connecting electrodes are located so as to provide an inter-connection between the respective electrodes of the two high-frequency circuit boards through the connecting electrodes and to be sandwiched between the respective electrodes thereof. The connecting electrodes are preferably composed of a plurality of electrode lines formed so as to be spaced at a predetermined interval on the outer periphery of the bar-shaped member.