To obtain excellent operability in an impedance characteristic adjustment operation.

A transmission-line transformer 1 which includes a core material 2 composed of a magnetic substance, and a transmission line 3 wherein the core material 2 includes a body 4 having the transmission line 3 wound therearound, and a movable unit 5 which can move relative to the body 4 while being kept in contact therewith wherein the transmission-line transformer 1 is provided on a substrate 6, at least a portion of the movable unit 5 (a head 11, for example) is located at the opposite side of the substrate 6 while placing the body 4 between, and the movable unit 5 is moved relative to the body 4 by an operation applied to at least a portion of the movable unit 5 (the head 11, for example).

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