Radio-frequency module and communication device

A radio-frequency module comprising:

• a mounting board having a first major surface and a second major surface opposite to each other;
• a first electronic component disposed on the first major surface of the mounting board;
• and
• a second electronic component disposed on the first major surface of the mounting board, the second electronic component being lower in height than the first electronic component, wherein
• the mounting board includes
• a plurality of dielectric layers,
• a plurality of conductive layers, and
• a plurality of via-conductors,
• in the mounting board, the plurality of dielectric layers and the plurality of conductive layers are stacked in a thickness direction of the mounting board,
• the mounting board has
• a first region overlapping the first electronic component when viewed in plan view in the thickness direction of the mounting board, the first region extending from the first major surface to the second major surface, and
• a second region overlapping the second electronic component when viewed in plan view in the thickness direction of the mounting board, the second region extending from the first major surface to the second major surface, and
• in the mounting board,
• of the plurality of conductive layers, conductive layers in the first region are fewer than conductive layers in the second region, and
• the first region is thinner than the second region.