Circuit board and circuit module

A circuit module, comprising:

• a flexible wiring board having a first section in one end and a second section next to the first section in a plan view;
• a plate-shaped reinforcing member embedded in the flexible wiring board in the first section;
• a first multilayer wiring layer on a top surface of the flexible wiring board in the first section, the first multilayer wiring layer having an opening that exposes a portion of a top surface of the reinforcing member in the first section;
• and
• a semiconductor device face-up mounted on the portion of the top surface of the reinforcement member exposed by the opening in the first multiplayer wiring layer.

A circuit board, comprising:

• a flexible wiring board having a plurality of layers laminated therein, including wiring layers and insulating layers, the wiring board having three sections arranged in a lengthwise direction of the wiring board:
• a first section in one end, a second section in a middle, and a third section in another end, the first section having a cavity or cutout in a plan view,
• a plate-shaped reinforcing member having a flat top surface, embedded in the cavity or cutout of the wiring board in the first section;
• a first multilayer wiring layer on a top surface of the wiring board in the first section, the first multilayer wiring layer having an opening that exposes a portion of the flat top surface of the reinforcing member for mounting a device thereon, the first multilayer wiring layer being absent on the wiring board in the second section;
• a second multilayer wiring layer on a bottom surface of the wiring board in the first section, the second multilayer wiring layer being absent on the wiring board in the second section.