The thermophysical properties of thermal sprayed coatings were measured nondestructively using photoacoustic method. As a measurement sample, a cylinder made of carbon steel S45C was used as a base. For the thermal spray coating, Al₂O₃·TiO (0.14 mm in thickness) whose optical absorption was dominant and YSZ (0.14 and 0.45 mm in thickness), which are typical materials for TBC, whose optical scattering was dominant were adopted. For each material, three kinds of sample with different porosity were prepared, one sprayed under normal condition, one with doubled spraying distance, and one with diagonal spraying. For Al₂O₃·TiO₂, the optical flux was directly incident on the sample, and the thermal diffusivity and thermal effusivity were simultaneously measured based on the RG theory. On the other hand, for YSZ, we applied a new method that does not directly irradiate the sample with the optical flux. The thermal effusivity was first determined by closely contacting an optically opaque titanium thin plate (0.05 mm in thickness) to a thermally thick sample with 0.45 mm in thickness. The thermal diffusivity was calculated by performing the same measurement on a thermally thin sample with 0.14 mm in thickness, with this thermal effusivity as known. It was found that the thermal diffusion performance decreased as the porosity increased in both samples. The same tendency was seen for the thermal effusivity.