Coil openings of a primary side coil element of a first transformer, a secondary side coil element of the first transformer, a primary side coil element of a second transformer, and a secondary side coil element of the second transformer overlap with one another when viewed from above in a lamination direction. The primary side coil element of the first transformer and the primary side coil element of the second transformer are connected in parallel, and the secondary side coil element of the first transformer and the secondary side coil element of the second transformer are connected in parallel. An impedance conversion ratio is defined in accordance with a lamination order of the primary side coil element and the secondary side coil element of the first transformer with respect to a lamination order of the primary side coil element and the secondary side coil element of the second transformer within a multilayer body.