Abstract: Disclosed is a mounting structure for electric elements in circuit blocks of an electric circuit, particularly suitable for an ultrahigh-frequency circuit, allowing such elements to be automatically mounted as well as soldered, by such a way that holding parts with configurations and dimensions compatible with terminal parts of the elements are provided at portions of metal pieces as wiring conductors respectively, which are embedded in a frame made of an insulator at a proper distance, and the elements are mounted and secured so that the terminals thereof are positioned on the holding parts of the metal pieces.