Pneumatic tire manufacturing method and pneumatic tire

A method of manufacturing a pneumatic tire having a tread rubber, the method comprising:

• a winding step of forming a rubber ribbon winding body constructing the tread rubber by spirally winding a rubber ribbon obtained by co-extruding a first rubber and a second rubber which are different in hardness,
• wherein the winding step differentiates the mainly arranged rubber between a first area positioned in a center portion and a second area positioned in an end portion in a tread width direction, or between a first area positioned in one side and a second area positioned in the other side in the tread width direction,
• wherein the first rubber is mainly arranged in the first area by making a cross sectional area ratio of the first rubber in relation to the rubber ribbon greater than a cross sectional area ratio of the second rubber,
• wherein the second rubber is mainly arranged in the second area by making the cross sectional area ratio of the first rubber in relation to the rubber ribbon smaller than the cross sectional area ratio of the second rubber,
• wherein a portion in which the cross sectional area ratio of the first rubber in relation to the rubber ribbon becomes smaller by smaller is provided from the first area toward the second area, and
• wherein the rubber ribbon retaining a compound interface between the first rubber and the second rubber is superposed and wound in a tread thickness direction to at least a part of the second area.