Provided is an image sensor which serves as a synchronization master for controlling synchronized image-capturing by means of a plurality of image sensors; terminates an image-capture operation on thebasis of a termination request upon acquisition of the termination request; and does not transmit, to another image sensor serving as a synchronization slave of which image-capturing is controlled bythe synchronization master, a synchronization-slave synchronization signal for controlling the image-capture timing in the image sensor serving as the synchronization slave.