A photoacoustic measurement apparatus which includes a diffuser plate which diffuses laser light inputted from the upstream side of an optical system, a lens system which focuses the laser light diffused by the diffuser plate, and an optical fiber cable which includes an optical fiber having a core and cladding structure and is disposed such that the laser light focused by the lens system is inputted from one end, in which the light projection unit projects the laser light guided by the optical fiber cable as the measuring light. In a photoacoustic measurement performed by guiding the measuring light using an optical fiber, high energy measuring light can be guided while inhibiting end face damage of the optical fiber.
