A columnar conductor 7 is a first columnar conductor provided in such a way as to penetrate an inner layer of the multilayer substrate 2A. A columnar conductor 9a, a columnar conductor 9b, a columnar conductor 9c, a columnar conductor 9d, a columnar conductor 9e, a columnar conductor 9f, a columnar conductor 9g, a columnar conductor 9h, a columnar conductor 9i, a columnar conductor 9j, a columnar conductor 9k and a columnar conductor 9l are multiple second columnar conductors provided in such a way as to penetrate the inner layer of the multilayer substrate 2A and to surround the columnar conductor 7. Because FIG. 13 shows a cross section of the high frequency filter 1A, the illustration of the columnar conductors 9a, 9h, 9i, 9j, 9k and 9l which are provided in one portion cut from the high frequency filter 1A is omitted.

A strip line 10A is a transmission line extending from an outer peripheral portion of the first substrate 4A to the inside thereof. One end portion of the strip line 10A extending inside the first substrate 4A is electrically connected to the columnar conductor 7. In addition, the other end portion of the strip line 10A is a port (1) electrically connected to an antenna element 100 shown in FIG. 3.