To provide a high-frequency module which can facilitate delicate characteristic regulation, without being influenced by an external unit and without decrease in power efficiency, and to provide a method for regulating its characteristics and a transmitting/receiving device.

A laser beam for laser trimming is transmitted through a cover 5 covering a dielectric plate 1 for constituting, for example, a resonator 5, and a hole 20 having a width and a depth of an opening for cutting off electromagnetic waves of a service frequency band is provided. Electrical characteristics are measured, in a state with all constituents being assembled including this cover 5, and laser trimming is conducted via the hole 20 so as to obtain desired characteristics.