In a tire mold 10, in which a tread molding section 12 for molding of a tread comprises a plurality of segments 18 divided in a tire circumferential direction and the respective segments are provided movably in a tire radial direction, ridges 20 for molding of transverse grooves T2 on a tread surface are protrusively provided at least at circumferential ends 23 of the segment 18 in a posture (more specifically, a posture in parallel to a direction M of movement of the segment) inclined outward to a direction toward a center Om of the segment so as to be away from a circumferentially central portion 22 of the segment as it goes toward tip ends thereof.