An imaging element comprising: a plurality of pixels disposed in an arrangement of a two-dimensional matrix, each of the pixels being configured to receive external light to generate an imaging signal corresponding to a light amount and output the imaging signal; a first vertical transfer line for receiving the imaging signal, the first vertical transfer line being connected with a portion of the plurality of pixels arranged in a column in the arrangement of the plurality of pixels; a reference voltage generator configured to generate a first reference voltage for a column-black reference signal, a second reference voltage for a line-black reference signal and a third reference voltage for phase adjustment; a phase adjusting signal generator configured to output a phase adjusting signal corresponding to the third reference voltage during a period in which the imaging signal is not output to an external device, the phase adjusting signal being used for phase adjustment; a first reference signal generator including a first source follower transistor connected to the first vertical transfer line and a first reset transistor supplying an output voltage of the reference voltage generator to a gate of the first source follower transistor, the first reference signal generator being configured to generate a column-black reference signal corresponding to the first reference voltage and output the column-black reference signal to the first vertical transfer line; a second reference signal generator including a second source follower transistor connected to a second vertical transfer line of the imaging element and a second reset transistor supplying the second reference voltage to a gate of the second source follower transistor, the second reference signal generator being configured to generate a line-black reference signal corresponding to the second reference voltage and output the line-black reference signal to the second vertical transfer line; and a timing generator configured to drive the phase adjusting signal generator, the first reference signal generator and the second reference signal generator to transmit the phase adjusting signal, the column-black reference signal and the line-black reference signal, respectively, to the external device during a transfer blanking period of the imaging signal. a plurality of pixels disposed in an arrangement of a two-dimensional matrix, each of the pixels being configured to receive external light to generate an imaging signal corresponding to a light amount and output the imaging signal; a first vertical transfer line for receiving the imaging signal, the first vertical transfer line being connected with a portion of the plurality of pixels arranged in a column in the arrangement of the plurality of pixels; a reference voltage generator configured to generate a first reference voltage for a column-black reference signal, a second reference voltage for a line-black reference signal and a third reference voltage for phase adjustment; a phase adjusting signal generator configured to output a phase adjusting signal corresponding to the third reference voltage during a period in which the imaging signal is not output to an external device, the phase adjusting signal being used for phase adjustment; a first reference signal generator including a first source follower transistor connected to the first vertical transfer line and a first reset transistor supplying an output voltage of the reference voltage generator to a gate of the first source follower transistor, the first reference signal generator being configured to generate a column-black reference signal corresponding to the first reference voltage and output the column-black reference signal to the first vertical transfer line; a second reference signal generator including a second source follower transistor connected to a second vertical transfer line of the imaging element and a second reset transistor supplying the second reference voltage to a gate of the second source follower transistor, the second reference signal generator being configured to generate a line-black reference signal corresponding to the second reference voltage and output the line-black reference signal to the second vertical transfer line; and a timing generator configured to drive the phase adjusting signal generator, the first reference signal generator and the second reference signal generator to transmit the phase adjusting signal, the column-black reference signal and the line-black reference signal, respectively, to the external device during a transfer blanking period of the imaging signal.