A pneumatic tire is capable of improving partial grinding resistance performance of tire shoulder, and improving drive stability and tractive quality. Protrusions (11) are provided in a buttress portion (20) at a position (30) having a largest width from a grounding end (E) to a tire width direction cross section, the protrusions (11) are composed of a center portion (11a) extending from the groove bottom (4) of the transverse grooves (2) toward the tire rotational axis and side portions (11b), the center portion (11a) and the side portions (11b) are integrally formed, the side portions (11b)extend from the same cross-sectional height as, that of the center portion toward the tire rotational axis, the protrusions (11) extend at least to a virtual line (22) in which the inner most belt layer (21a) is virtually extended to the buttress portion (20), and the width W of the side portions (11b) is 7% to 30% of the depth (D) of the transverse grooves (2), and the thickness (L) of the protrusions (11) on the virtual line (22) is 1 mm to 10 mm.