Photoelectric conversion apparatus and equipment having photodiode and semiconductor regions

A photoelectric conversion apparatus comprising:

• a photodiode that includes a first semiconductor region of a first conductive type and a second semiconductor region of a second conductive type opposite to the first conductive type;
• a third semiconductor region of the first conductive type that holds a charge supplied from the first conductive region;
• a transistor that includes a gate connected to a node including the third semiconductor region, a fourth semiconductor region of the first conductive type as a drain, and a fifth semiconductor region of the first conductive type as a source;
• and
• a switch that connects the node and the drain, wherein
• one of the second semiconductor region and the fifth semiconductor region is a p-type semiconductor region to which first potential is supplied,
• the other of the second semiconductor region and the fifth semiconductor region is an n-type semiconductor region to which second potential is supplied, and
• the second potential is higher than the first potential.