A connection terminal has, on an upper surface of a first dielectric layer, a first line conductor and a first grounding line conductor provided adjacent to both sides of the first line conductor, and has, on an upper surface of a third dielectric layer, a third line conductor and a third grounding line conductor provided adjacent to both sides of the third line conductor. These conductors are connected to a second line conductor and a second grounding line conductor provided adjacent to both sides of the second line conductor, respectively, the second line conductor and the second grounding line conductor being provided on an upper surface of a second dielectric layer. It is possible to obtain the connection terminal having a small size and capable of complying with a high-frequency signal.