Surface-acoustic-wave-device mount substrate, high-frequency module using the same, and communication apparatus

A surface-acoustic-wave-device mount substrate for mounting a surface-acoustic-wave device comprising:

• an insulating substrate in which a plurality of insulating layers are laminated, to one surface whereof are adhered at least a pair of input and output electrodes, and a ring-shaped ground electrode around the input and output electrodes;
• a planar conductor layer on the one surface and inside the insulating substrate;
• and
• a via-conductor passing through the insulating layers and formed by firing metal-powder-containing paste charged therein,
• wherein the ring-shaped ground electrode on the surface of the insulating substrate is electrically connected to ground electrodes on another surface on an opposite side of the one surface of the insulating substrate through a plurality of via-conductors formed in different positions as seen in plan view, and the plurality of via-conductors includes a first via connector which is disposed in vicinity to the ring-shaped ground electrode and connected directly or indirectly to the ring-shaped ground electrode, and among the plurality of via connectors, via-conductors other than the first via-conductor are disposed outside a ring-shaped electrode region, as seen in plan view, where the ring-shaped ground electrode is formed.