A probe unit for receiving an acoustic wave includes a probe, an output unit, and a connector, wherein the output unit is configured to output an acoustic wave signal detected by the probe to an acoustic wave device, and the connector is configured to be detachably connected with a light irradiation unit that includes a light emitting unit and a target guide, such that the probe and the connector are disposed so as to allow an operator to visually check a region to be irradiated when the operator places the probe so as to be acoustically coupled with an object.
