A hydraulic machine of radial-piston type comprising: a plurality of pistons disposed along a radial direction of the hydraulic machine; a plurality of cylinders for guiding the respective pistons; a plurality of rollers disposed rotatably on the respective pistons of the plurality of pistons at least one cam configured to contact the plurality of rollers, the at least one cam being rotatable about a center axis of the hydraulic machine characterised in that; a side plate is mounted to a rotary section of the hydraulic machine, the rotary section including the at least one cam and being configured to rotate about the center axis with the at least one cam, and the side plate extending along the radial direction from the at least one cam toward the pistons, wherein either a) the side plate includes a resin portion forming a first surface which is a side plate surface facing a roller end surface, and each roller of the plurality of rollers includes a metal portion forming a second surface which is the roller end surface, or b) each roller of the plurality of rollers includes a resin portion forming a first surface which is a roller end surface facing a side plate surface, and the side plate includes a metal portion forming a second surface which is the side plate surface, wherein the metal portion includes: a first region at which a distance along an axial direction of the rollers between the second surface formed by the metal portion and the first surface formed by the resin portion is a minimum distance, and a second region at which a distance along the axial direction of the rollers between the second surface and the first surface is a distance which is larger than the minimum distance of the first region, the second region forming an edge portion of the first region, and wherein the second region forming the edge portion of the metal portion has a surface roughness of at most 0.8 μm Ra. a plurality of pistons disposed along a radial direction of the hydraulic machine; a plurality of cylinders for guiding the respective pistons; a plurality of rollers disposed rotatably on the respective pistons of the plurality of pistons at least one cam configured to contact the plurality of rollers, the at least one cam being rotatable about a center axis of the hydraulic machine characterised in that; a side plate is mounted to a rotary section of the hydraulic machine, the rotary section including the at least one cam and being configured to rotate about the center axis with the at least one cam, and the side plate extending along the radial direction from the at least one cam toward the pistons, wherein either a) the side plate includes a resin portion forming a first surface which is a side plate surface facing a roller end surface, and each roller of the plurality of rollers includes a metal portion forming a second surface which is the roller end surface, or b) each roller of the plurality of rollers includes a resin portion forming a first surface which is a roller end surface facing a side plate surface, and the side plate includes a metal portion forming a second surface which is the side plate surface, wherein the metal portion includes: a first region at which a distance along an axial direction of the rollers between the second surface formed by the metal portion and the first surface formed by the resin portion is a minimum distance, and a second region at which a distance along the axial direction of the rollers between the second surface and the first surface is a distance which is larger than the minimum distance of the first region, the second region forming an edge portion of the first region, and a first region at which a distance along an axial direction of the rollers between the second surface formed by the metal portion and the first surface formed by the resin portion is a minimum distance, and a second region at which a distance along the axial direction of the rollers between the second surface and the first surface is a distance which is larger than the minimum distance of the first region, the second region forming an edge portion of the first region, and wherein the second region forming the edge portion of the metal portion has a surface roughness of at most 0.8 μm Ra.