PROBLEM TO BE SOLVED: To provide a photoacoustic imaging apparatus capable of acquiring a clear image by performing phasing addition.SOLUTION: A photoacoustic imaging apparatus 100 includes: a light source part 10 a detection part 20 for detecting a photoacoustic wave signal attributed to a photoacoustic wave AW generated from a detection object Q in a subject P that has absorbed light from the light source part 10 and a signal processing part 31 for correcting a decrease in the signal strength of the photoacoustic wave signal attributed to the attenuation of the photoacoustic wave AW, and generating an image by performing phasing addition of the corrected photoacoustic wave signal.SELECTED DRAWING: Figure 9COPYRIGHT: (C)2016,JPO&INPIT