Solid-state imaging device

An imaging system comprising:

• a solid-state imaging device;
• and
• a signal processing unit configured to process a signal from the solid-state imaging device, wherein
• the solid-state imaging device including:
• a well formed of a first semiconductor region of a first conductivity type provided in a semiconductor substrate;
• a pixel provided in the well, and including a photoelectric conversion element, and a transistor including a second semiconductor region of a second conductivity type;
• a first contact electrode electrically connected to the first semiconductor region;
• and
• a second contact electrode electrically connected to the second semiconductor region,
• wherein the first contact electrode has a contact area to the semiconductor substrate larger than that of the second contact electrode, and has different widths in a first direction and a second direction perpendicular to the first direction in a planar view, and
• wherein the width of the first contact electrode in the first direction is smaller than a width of the second contact electrode.