Object information acquiring apparatus

An object information acquiring apparatus comprising:

• an optical transmission system for transmitting light from a light source;
• a photoacoustic probe including an irradiating end for irradiating an object with the light and a receiver for receiving acoustic waves generated by the object that has been irradiated with the light;
• a processor for acquiring information on the object based on the acoustic waves;
• a light quantity meter for measuring a quantity of light emitted from the irradiating end;
• a memory for storing a measurement value measured by the light quantity meter;
• and
• a presentation unit, wherein
• the processor compares the measurement value with a reference value of light quantity or a history of measurement value stored in the memory to determine whether or not the measurement value is within a reference range, and has the presentation unit present a result of the determination thereon.