Semiconductor device and electronic device

An electronic device comprising:

• a semiconductor device;
• an optical lens that forms an image of image light from a subject onto an imaging surface of the semiconductor device;
• and
• a signal processing circuit that performs signal processing on signals output from the semiconductor layer,
• the semiconductor device including:
• a semiconductor layer having an upper surface portion, a lower surface portion, and a side surface portion;
• and
• a field-effect transistor in which a channel forming portion is provided in the semiconductor layer,
• the field-effect transistor including:
• a gate electrode provided in the channel forming portion of the semiconductor layer over the upper surface portion and the side surface portion of the semiconductor layer with a gate insulating film interposed therebetween;
• and
• a pair of main electrode regions provided on an outer side of the semiconductor layer in a channel length direction of the channel forming portion and separated from each other with the channel forming portion interposed therebetween, wherein
• each of the pair of main electrode regions includes a conductor layer that is provided in contact with the side surface portion of the semiconductor layer and that is in a layer different from the semiconductor layer.