A pneumatic tire comprises a tread portion having an outside tread edge and an inside tread edge. The tread portion is provided with: a plurality of oblique grooves extending from the outside tread edge toward the inside tread edge beyond the tire equator, while inclining to one circumferential direction corresponding to the tire rotational direction at angles of from 20 to 45 degrees with respect to said one circumferential direction; and a plurality of connecting grooves extending between the oblique grooves at angles β of from 90 to 180 degrees with respect to said one circumferential direction. Between every two of the adjacent oblique grooves, there are disposed are three or more of the connecting grooves which are gradually decreased in the angle β from the outside tread edge towards the inside tread edge, whereby a plurality of oblique blocks are formed between every two of the adjacent oblique grooves.