To more reliably synchronize exposure with light emission by improving a time lag before light emission is started, in imaging using bidirectional wireless communication between an imaging apparatus and a flash light device installed on the outside.

In imaging using a wireless stroboscopic system, after a release switch is pushed, a camera microcomputer 101 starts drive of a front curtain of a focal plane shutter before confirming communication with a slave flash light device 300A (MG3-1). Then, after confirming the communication with the slave flash light device 300A, the camera microcomputer 101 transmits a light emission start signal to the slave flash light device 300A and also starts accumulation in electronic shutter mode.