PROBLEM TO BE SOLVED: To provide a technique of, in photoacoustic imaging, obtaining a photoacoustic signal at an interval shorter than an arrangement interval of reception elements.SOLUTION: A subject information acquisition device includes: a probe where a plurality of reception elements, which each receive an acoustic wave generated from a subject irradiated with light from a light source and convert the acoustic wave into an electric signal, are arranged in a first direction； moving means for moving the probe in the first direction； control means for controlling the light source and the moving means； and generation means for generating data on an internal image of the subject on the basis of the electric signal. The control means performs control to irradiate the subject with the light each time the probe is moved by a distance that is (n+1)/k times or (n-1)/k times as long as an arrangement interval of the reception elements, where n is an integer equal to or larger than one and k is an integer equal to or larger than two.SELECTED DRAWING: Figure 1【課題】光音響イメージングにおいて、受信素子の配列間隔よりも細かい間隔で光音響信号を取得するための技術を提供する。【解決手段】光源から光を照射された被検体から発生する音響波を受信して電気信号に変換する複数の受信素子が第１の方向に配列されたプローブと、プローブを第１の方向に移動させる移動手段と、光源および移動手段を制御する制御手段と、電気信号に基づいて被検体内部の画像データを生成する生成手段を有し、制御手段は、ｎを１以上の整数、ｋを２以上の整数としたとき、プローブが受信素子の配列間隔の（ｎ＋１／ｋ）倍または（ｎ－１／ｋ）倍の距離を移動するごとに光が照射されるように制御を行う被検体情報取得装置を用いる。【選択図】図１
