An image sensor includes: unit pixels; first transfer lines; a constant current source; a reset noise removal unit; a second transfer line; and a control unit configured to drive output units of the unit pixels respectively positioned in different rows at a same time in at least a part of a period, to drive a charge transfer unit of the unit pixel positioned in one row and perform a reset noise removal operation, then to transfer the signal to the second transfer line while keeping an output unit of the unit pixel driven, and to drive a charge transfer unit of the unit pixel positioned in another row and perform the reset noise removal operation, in an operation period in which an output unit of the unit pixel positioned in the one row transfers the signal to the second transfer line.