This photoacoustic imaging device (100) comprises: a display unit (40) that rewrites a screen (40a) at a predetermined refresh rate (RC) and that displays an image on the screen and a control unit (30) that performs the acquisition of a detection signal and irradiation with light by a semiconductor light-emitting-element light-source unit at a sampling cycle (SC) shorter than the cycle of the predetermined refresh rate, and that creates an image to be displayed on the display unit from the detection signal detected according to the sampling cycle.
