A method for manufacturing a pneumatic tire comprising a carcass extending from a tread portion through sidewall portions to bead cores in bead portions and a tread reinforcement layer disposed radially outward of the carcass in the tread portion, the method comprising: a tread reinforcement layer formation step of forming the tread reinforcement layer, wherein the tread reinforcement layer formation step comprises a winding step of winding a long belt-like ply formed by covering one or more reinforcement cords with a topping rubber around an approximately cylindrical winding surface, the winding step comprises: a first winding step of winding the belt-like ply in a spiral manner from a first end portion located on one side in a tire axial direction to a second end portion located on the other side in the tire axial direction while separating side edges of the belt-like ply from each other in turn; and a second winding step of winding the belt-like ply in a spiral manner reversely with respect to the first winding step from the second end portion to the first end portion while separating the side edges of the belt-like ply from each other in turn to form a grid-shaped tread reinforcement layer having approximately diamond-shaped spaces surrounded by the belt-like ply wherein the winding step is carried out with a single continuous belt-like ply, wherein, when the first winding step and the second winding step are set as one cycle, the winding step is performed in at least two cycles. a tread reinforcement layer formation step of forming the tread reinforcement layer, wherein the tread reinforcement layer formation step comprises a winding step of winding a long belt-like ply formed by covering one or more reinforcement cords with a topping rubber around an approximately cylindrical winding surface, the winding step comprises: a first winding step of winding the belt-like ply in a spiral manner from a first end portion located on one side in a tire axial direction to a second end portion located on the other side in the tire axial direction while separating side edges of the belt-like ply from each other in turn; and a second winding step of winding the belt-like ply in a spiral manner reversely with respect to the first winding step from the second end portion to the first end portion while separating the side edges of the belt-like ply from each other in turn to form a grid-shaped tread reinforcement layer having approximately diamond-shaped spaces surrounded by the belt-like ply wherein the winding step is carried out with a single continuous belt-like ply, wherein, when the first winding step and the second winding step are set as one cycle, the winding step is performed in at least two cycles. a first winding step of winding the belt-like ply in a spiral manner from a first end portion located on one side in a tire axial direction to a second end portion located on the other side in the tire axial direction while separating side edges of the belt-like ply from each other in turn; and a second winding step of winding the belt-like ply in a spiral manner reversely with respect to the first winding step from the second end portion to the first end portion while separating the side edges of the belt-like ply from each other in turn to form a grid-shaped tread reinforcement layer having approximately diamond-shaped spaces surrounded by the belt-like ply