In a photoacoustic imaging apparatus (100), a detecting portion (20) includes a light source portion (21) having a plurality of LED elements (21a, 21b), an ultrasonic detector (24) arranged in the vicinity of the light source portion, configured to detect an acoustic wave as an ultrasonic wave generated by absorption of light emitted from the light source portion to a test object, and a light source drive circuit arranged in the vicinity of the light source portion, driving the light source portion.
