A heavy duty tire comprising: a tread portion provided with a center circumferential groove disposed on the tire equator (Co), an axially outer shoulder circumferential groove disposed on each side of the tire equator (Co), a middle circumferential groove disposed between the center circumferential groove and each of the shoulder circumferential grooves so that the tread portion is axially divided into two crown land regions between the middle circumferential grooves and the center circumferential groove, two middle land regions between the middle circumferential grooves and the shoulder circumferential grooves, and two shoulder land regions axially outside the shoulder circumferential grooves, wherein each of the crown land regions and the middle land regions is a circumferentially continuously extending rib, each of the shoulder land regions is provided with shoulder axial grooves extending across the entire axial width of the shoulder land region and divided into shoulder blocks, on each side of the tire equator (Co), an axial distance from the center line of the shoulder circumferential groove to the tire equator (Co) is more than an axial distance from the center line of the shoulder circumferential groove to the tread edge, the tread edges being the axial outermost edges of the ground contacting patch of the tire which occurs when the tire is mounted on its standard wheel rim, inflated to its maximum air pressure and loaded to its maximum load and when the camber angle of the tire is zero, and a groove width (Ws) of each of the shoulder circumferential grooves is more than 5.0 mm, and more than a groove width (Wc) of the center circumferential groove and a groove width (Wm) of the middle circumferential grooves, characterized in that the groove width (Wc) of the center circumferential groove is more than 3.0 mm and less than 6.0 mm, and the groove width (Wm) of each of the middle circumferential grooves is more than 3.0 mm and less than 6.0 mm. a tread portion provided with a center circumferential groove disposed on the tire equator (Co), an axially outer shoulder circumferential groove disposed on each side of the tire equator (Co), a middle circumferential groove disposed between the center circumferential groove and each of the shoulder circumferential grooves so that the tread portion is axially divided into two crown land regions between the middle circumferential grooves and the center circumferential groove, two middle land regions between the middle circumferential grooves and the shoulder circumferential grooves, and two shoulder land regions axially outside the shoulder circumferential grooves, wherein each of the crown land regions and the middle land regions is a circumferentially continuously extending rib, each of the shoulder land regions is provided with shoulder axial grooves extending across the entire axial width of the shoulder land region and divided into shoulder blocks, on each side of the tire equator (Co), an axial distance from the center line of the shoulder circumferential groove to the tire equator (Co) is more than an axial distance from the center line of the shoulder circumferential groove to the tread edge, the tread edges being the axial outermost edges of the ground contacting patch of the tire which occurs when the tire is mounted on its standard wheel rim, inflated to its maximum air pressure and loaded to its maximum load and when the camber angle of the tire is zero, and a groove width (Ws) of each of the shoulder circumferential grooves is more than 5.0 mm, and more than a groove width (Wc) of the center circumferential groove and a groove width (Wm) of the middle circumferential grooves, characterized in that the groove width (Wc) of the center circumferential groove is more than 3.0 mm and less than 6.0 mm, and the groove width (Wm) of each of the middle circumferential grooves is more than 3.0 mm and less than 6.0 mm.