Provided is a particle having a large photoacoustic signal per unit dye, the particle including: one of a hydrophobic metal naphthalocyanine dye and a hydrophobic metal phthalocyanine dye one of an oil, a fatty acid, and a fatty acid ester as a matrix material and a surfactant, in which a ratio of the weight of the matrix material to the weight of the particle is 50% or more.