1. A digital camera which performs an exposure while rotating, comprising: a housing provided with an optical lens; an imager provided to the housing and having an imaging surface onto which an optical image of an object scene is irradiated through the optical lens; a measurer that repetitively measures a rotation angle of the housing; an exposer that performs an exposure processing on the imager every time that the measurement result by the measurer and an angle of view of the optical image irradiated onto the imaging surface satisfy an angular condition; a suppresser that suppresses a change in a positional relationship between the imaging surface and the optical image irradiated onto the imaging surface by moving at least one of the optical lens and the imager on the basis of the measurement result; wherein the change is due to rotation of the housing during a period of the exposure processing being performed, a first invalidator that invalidates the suppresser during a period from an end of one exposure processing to a start of the next exposure processing, by the exposer; a mover that moves said at least one of the optical lens and the imager in a direction that a maximum value of displacement which is suppressible by the suppresser in the next exposure period is increased, during a period when the suppresser is invalidated by the first invalidator; and a capturer that captures the object scene image generated on the imaging surface according to the exposure processing by the exposer in a memory.