Light detecting device and electronic device

A light detecting device, comprising:

• a pixel unit having four pixels, wherein
• each pixel of the four pixels in the pixel unit has two photoelectric conversion regions, two transfer transistors, and two charge holding regions, and
• the charge holding regions of the respective pixels of the pixel unit are electrically connected to each other,
• the four pixels of the pixel unit include a first pixel, a second pixel, a third pixel, and a fourth pixel,
• the first pixel includes first and second charge holding regions,
• the second pixel includes third and fourth charge holding regions,
• the third pixel includes fifth and sixth charge holding regions,
• the fourth pixel includes seventh and eighth charge holding regions,
• a first line connecting the first charge holding region and the fifth charge holding region and a second line connecting the second charge holding region and the sixth charge holding region are parallel, and
• a third line connecting the first charge holding region and the second charge holding region and a fourth line connecting the fifth charge holding region and the sixth charge holding region are parallel.