A laminate type line transformer. On one side of an insulating substrate, a primary coil section which is a laminate of a first coil pattern layer and a second coil pattern layer with an insulating layer in-between is provided. On the other side of the insulating substrate, a secondary coil section which is a laminate of a first coil pattern layer and a second coil pattern layer with an insulating layer in-between is provided. Both in the primary coil section and in the secondary coil section, conductors of the first coil pattern layer and conductors of the second coil pattern layer are electrically connected alternately via a hole made in the insulating layer.