To decrease resistance by increasing the conductor thickness of a conductor pattern constituting a transmission line equivalently, and to suppress a transmission loss caused by the concentration of an electric field on a bend in the case of a conductor pattern having a bend.

In the electronic circuit unit for transmitting power through a transmission line 103 constituted of a conductor pattern, a matching circuit 101 is connected with the output end of a power amplifier 102. The matching circuit 101 comprises a first conductor pattern 14 having bends P1-P4 formed on the first dielectric layer 11 of a multilayer substrate 10 including a plurality of dielectric layers 11-13, a second conductor pattern 15 formed oppositely to the first conductor pattern 14 on an adjacent second dielectric layer 12, and connection conductors 16-20 provided at least at the bends P1-P4 of the first and second conductor patterns 14 and 15.