A composite high frequency apparatus includes a high frequency filter and a high frequency switch which have a substantially reduced size and do not require an impedance matching circuit. The apparatus includes a multilayered base having an outer surface with a plurality of diodes, an external ground electrode, an external electrode for a transmission circuit, an external electrode for a receiving circuit, an external electrode for an antenna circuit and external electrodes for control terminals located thereon. A plurality of strip lines, capacitor electrodes and an external grounding electrode are located within the multilayered base.