Imaging device and method of driving imaging device

A method of driving an imaging device including a pixel array unit in which a plurality of pixels each including a first photoelectric converter, a second photoelectric converter, a first transfer transistor connected with the first photoelectric converter, and a second transfer transistor connected with the second photoelectric converter are two-dimensionally disposed, the method comprising:

• turning on the first transfer transistor at each of a part of pixels of the plurality of pixels to output a first analog signal;
• turning on the first transfer transistor and the second transfer transistor at each of the part of the pixels to output a second analog signal after the turning on the first transfer transistor step;
• performing analog-digital conversion of the first analog signal;
• performing analog-digital conversion of the second analog signal;
• and
• turning on the first transfer transistor and the second transfer transistor at each of other part of pixels of the plurality of pixels to output the second analog signal,
• wherein the number of the second analog signals output from the pixel array unit is larger than the number of the first analog signals output from the pixel array unit, and
• wherein the turning on the first transfer transistor and the second transfer transistor at each of the part of the pixels to output a second analog signal step is performed before the performing analog-digital conversion of the first analog signal step ends.