A subject information acquisition device comprising: elastic wave receiving means configured to receive elastic waves generated from a subject and output a reception signal; and signal processing means configured to acquire subject information of an interest region on the basis of the reception signal, characterized by: moving means configured to move the elastic wave receiving means to a plurality of different positions to form a first scanning area and a second scanning area and form an overlap area which is an area where the first scanning area and the second scanning area partially overlap; and wherein the interest region is a specific position in the overlap area, wherein, at a first plurality of different positions included in the first scanning area, the elastic wave receiving means receives elastic waves and outputs a first plurality of reception signals corresponding to the first plurality of different positions, wherein, at a second plurality of different positions included in the second scanning area, the elastic wave receiving means receives elastic waves and outputs a second plurality of reception signals corresponding to the second plurality of different positions, wherein the signal processing means acquires a first plurality of corrected reception signals corresponding to the first plurality of different positions by correcting the first plurality of reception signals with a first plurality of weighting factors determined based on a first plurality of measurement parameters corresponding to the first plurality of different positions and a position of the interest region and acquires a first sum of the first plurality of corrected reception signals, wherein the signal processing means acquires a second plurality of corrected reception signals corresponding to the second plurality of different positions by correcting the second plurality of reception signals with a second plurality of weighting factors determined based on a second plurality of measurement parameters corresponding to the second plurality of different positions and a position of the interest region and acquires a second sum of the second plurality of corrected reception signals, and wherein the signal processing means acquires the subject information of the interest region on the basis of a sum of the first sum and the second sum, and a sum of the first plurality of weighting factors and the second plurality of weighting factors. elastic wave receiving means configured to receive elastic waves generated from a subject and output a reception signal; and signal processing means configured to acquire subject information of an interest region on the basis of the reception signal, characterized by: moving means configured to move the elastic wave receiving means to a plurality of different positions to form a first scanning area and a second scanning area and form an overlap area which is an area where the first scanning area and the second scanning area partially overlap; and wherein the interest region is a specific position in the overlap area, moving means configured to move the elastic wave receiving means to a plurality of different positions to form a first scanning area and a second scanning area and form an overlap area which is an area where the first scanning area and the second scanning area partially overlap; and wherein the interest region is a specific position in the overlap area, wherein, at a first plurality of different positions included in the first scanning area, the elastic wave receiving means receives elastic waves and outputs a first plurality of reception signals corresponding to the first plurality of different positions, wherein, at a second plurality of different positions included in the second scanning area, the elastic wave receiving means receives elastic waves and outputs a second plurality of reception signals corresponding to the second plurality of different positions, wherein the signal processing means acquires a first plurality of corrected reception signals corresponding to the first plurality of different positions by correcting the first plurality of reception signals with a first plurality of weighting factors determined based on a first plurality of measurement parameters corresponding to the first plurality of different positions and a position of the interest region and acquires a first sum of the first plurality of corrected reception signals, wherein the signal processing means acquires a second plurality of corrected reception signals corresponding to the second plurality of different positions by correcting the second plurality of reception signals with a second plurality of weighting factors determined based on a second plurality of measurement parameters corresponding to the second plurality of different positions and a position of the interest region and acquires a second sum of the second plurality of corrected reception signals, and wherein the signal processing means acquires the subject information of the interest region on the basis of a sum of the first sum and the second sum, and a sum of the first plurality of weighting factors and the second plurality of weighting factors.