A subject information acquisition apparatus includes a first holding member that holds a subject, a probe that receives an elastic wave from the subject through the first holding member, a first holding member deformation amount measuring unit that measures an amount of deformation of the first holding member, and a processing unit that creates an area for generating subject information by using the amount of deformation of the first holding member and position information of the first holding member deformation amount measuring unit and generates an information value of subject information corresponding to the area for generating subject information by using a signal outputted by the probe.