A method of the present invention that is used for manufacturing a reinforcing cord for rubber reinforcement includes: (i) forming second strands each of which is formed by twisting a plurality of first strands together in a first direction, with the first strands including glass filaments as reinforcing fibers; (ii) forming a cord including a plurality of second strands and a treatment agent that has been applied to the second strands, with the plurality of second strands having been twisted together in the same direction as the first direction; and (iii) bonding the second strands to each other by solidifying the treatment agent, with a tensile load of 40 to 800 N per 1 mm 2 of the sectional area of the glass filaments being applied to the cord.