An imaging apparatus includes: plurality of control units configured to control an imaging function; a requesting unit configured to request execution of start-up processing of a plurality of the control units; a detecting unit configured to detect movement to be applied to a device main unit; and a start-up control unit configured to cause, upon the detecting unit detecting particular movement in a power-off state wherein the movement of the device main unit externally appears to be stopped, each of a plurality of the control units to start the start-up processing still in the power-off state, and upon execution of the start-up processing being requested from the requesting unit, cause a plurality of the control units to start reception of an imaging command according to the states of the start-up processing of a plurality of the control units.