Semiconductor device and manufacturing method of same

A semiconductor device comprising:

• a plurality of semiconductor chips layered on a circuit substrate, wherein:
• at least two semiconductor chips are respectively a first semiconductor chip, and a second semiconductor chip, each of which has a circuit formation surface and a reverse surface with respect to the circuit formation surface,
• the first semiconductor chip being mounted on the circuit substrate in such a manner that the reverse surface of the first semiconductor chip faces the circuit substrate,
• the second semiconductor chip (i) being mounted on the first semiconductor chip in such a manner that the reverse surface of the second semiconductor chip faces the circuit formation surface of the first semiconductor chip, and (ii) having protruded part formed by protruding at least one outer edge of the second semiconductor chip from an outer edge of the first semiconductor chip as viewed from above,
• the first semiconductor chip and the second semiconductor chip being wire-bonded with the circuit substrate;
• the semiconductor device comprising a mounting-use bonding layer on the reverse surface of the second semiconductor chip,
• the mounting-use bonding layer functioning as a bonding agent for mounting the second semiconductor chip on the first semiconductor chip, and filling a gap between (i) the circuit substrate and (ii) the protruded part of second semiconductor chip;
• and
• wherein a surface of the mounting-use bonding layer has the same shape as the reverse surface of the second semiconductor chip, the surface being in touch with the reverse surface of the second semiconductor chip.