Imaging device and imaging system

An imaging system comprising

• an imaging device, and
• an arithmetic processing unit to which a signal from the imaging device is to be inputted, wherein
• the imaging device includes
• a semiconductor substrate having a first surface and a second surface opposed to each other, and provided with a plurality of pixels,
• a wiring layer which is provided on side of the second surface of the semiconductor substrate and to which a signal is to be transmitted for each of the plurality of pixels,
• a light-blocking film opposed to the wiring layer with the semiconductor substrate interposed therebetween and having an opening satisfying Expression (1) below for each of the pixels, and
• a waveguide provided on side of the first surface of the semiconductor substrate for each of the plurality of pixels and extending to the opening of the light-blocking film:
• B
• <
• A
• (
• 1
• )
• where B is an area of the opening in each pixel, and A is an area of the first surface covered with the light-blocking film in each pixel.