A solid state imaging device includes: an imaging device substrate with an imaging device section formed on a first major surface side thereof; a backside interconnect electrode provided on a second major surface side of the imaging device substrate and electrically connected to the imaging device section, the second major surface being on the opposite side of the first major surface; a circuit substrate provided with a circuit substrate electrode opposed to the second major surface; a connecting portion electrically connecting the backside interconnect electrode to the circuit substrate electrode; and a light shielding layer provided coplanar with the backside interconnect electrode or on the circuit substrate side of the backside interconnect electrode.