An object information acquisition apparatus includes: a plurality of acoustic wave detecting elements configured to detect an photoacoustic wave generated when an object is irradiated with light and output time-series detection signals； a member disposed outside the object； and a signal processing unit configured to acquire optical property information inside the object by performing image reconstruction through iterative reconstruction method in accordance with the time-series detection signals and an operand for which a response of the photoacoustic wave deriving from the member has been considered.
