Pneumatic tire

Pneumatic tire of which the stiffness of tread blocks is improved in a circumferential direction, wherein first grooves (11) of first block (20) with a short pitch length are formed to have a depth shallower than the depth second grooves (21) of a second block (20) and the stiffness of the first blocks is similar to the stiffness of the second blocks; further, a first angle of the groove walls of the first grooves (11) is larger than a second angle of the groove walls of the second grooves (21); accordingly, there is an effect of improving the braking performance or grip performance of a tire by making the stiffness of the tire uniform in the circumferential direction of the tire.