The light irradiation range of a probe for a photoacoustic measurement apparatus is increased. The probe for a photoacoustic measurement apparatus includes a light transmission unit that irradiates a subject with light, and a photoacoustic wave detector 52 that detects a photoacoustic wave generated from the subject. The light transmission unit includes light propagation part 51 for propagating light, and a light transmission member 55. Further, the light transmission member 55 includes an inner peripheral surface 55a that is formed in the shape of a curved concave surface and an outer peripheral surface 55b that has a radius of curvature larger than the radius of curvature of the inner peripheral surface 55a and is formed in the shape of a curved convex surface. The outer peripheral surface 55b is disposed so that the light L emitted from the light propagation part 51 is incident on the inner peripheral surface 55a.