Rubber product and method of producing same

A method of producing a rubber product including molding a molded body having a cylindrical shape in which a plurality of reinforcing layers are coaxially layered between an inner layer and an outer layer, composing each of the reinforcing layers of cord fabrics that include a plurality of fiber cords aligned in a density of 30 cords/5 cm or more and 70 cords/5 cm or less and are subjected to an adhesion treatment and coating rubber layers covering both surfaces of the cord fabric, forming a bias structure in which the fiber cords of adjacently layered ones of the reinforcing layers intersect and extend, and producing, by vulcanizing the molded body, a rubber product including a cylindrical portion in which the plurality of reinforcing layers are coaxially layered and embedded between the inner layer and the outer layer,

• the method comprising:
• using each of the cord fabrics having specifications:
• a tensile strength of 4320 N/cm or more relative to an extension direction of the fiber cords comprising the cord fabric and a weight of 950 g/m2 or less,
• making each of the cord fabrics have a bending hardness of 30 g/cm or less after the adhesion treatment;
• and
• making each of the coating rubber layers have a layer thickness of 0.2 mm or more and 1 mm or less.