1. An imaging apparatus comprising: continuous imaging mode setting means for setting a continuous imaging mode in which a plurality of captured images including first and second captured images are continuously acquired; and diaphragm control means for controlling a diaphragm in an imaging optical system, wherein in the continuous imaging mode, the diaphragm control means does not drive the diaphragm during a first period from the time of exposure for the first captured image to the time of exposure for the second captured image but maintains the state of the diaphragm at the time of exposure for the first captured image until the time of exposure for the second captured image.