A motorcycle tire for running on rough terrain comprising: a tread portion being provided with a first block pair comprising a shoulder block and a middle block arranged adjacently to each other in an axial direction of the tire through a first groove bottom having a first thinnest rubber portion at a point on the outer surface of the first groove bottom at which, in a first tire cross-section passing the first block pair, a minimum rubber thickness between the first groove bottom and an inner cavity surface of the tire is provided, or at the middle point of the first groove bottom in the tire axial direction when the rubber thickness between the first groove bottom and the inner cavity is constant, wherein the shoulder block comprises a ground contact surface having an axially inner edge and a tread edge (Te) and the middle block comprises a ground contact surface having an axially outer edge, wherein in the first tire cross-section, a distance from the first thinnest rubber portion to the axially inner edge of the shoulder block is greater than a distance from the first thinnest rubber portion to the axially outer edge of the middle block, wherein the tread portion is further provided with a second block pair comprising a middle block and a central block arranged adjacently to each other in the axial direction of the tire through a second groove bottom having a second thinnest rubber portion at a point on the outer surface of the second groove bottom at which, in a second tire cross-section passing the second block pair, a minimum rubber thickness between the second groove bottom and the inner cavity surface of the tire is provided, or at the middle point of the second groove bottom in the tire axial direction when the rubber thickness between the second groove bottom and the inner cavity is constant, wherein the middle block of the second block pair comprises a ground contact surface having an axially inner edge and the central block comprises a ground contact surface having an axially outer edge, and in the second tire cross-section, a distance from the second thinnest rubber portion to the axially inner edge of the middle block is greater than a distance from the second thinnest rubber portion to the axially outer edge of the central block, characterized in that the shoulder block, the middle block and the central block are arranged adjacently to one another in the axial direction of the tire. a tread portion being provided with a first block pair comprising a shoulder block and a middle block arranged adjacently to each other in an axial direction of the tire through a first groove bottom having a first thinnest rubber portion at a point on the outer surface of the first groove bottom at which, in a first tire cross-section passing the first block pair, a minimum rubber thickness between the first groove bottom and an inner cavity surface of the tire is provided, or at the middle point of the first groove bottom in the tire axial direction when the rubber thickness between the first groove bottom and the inner cavity is constant, wherein the shoulder block comprises a ground contact surface having an axially inner edge and a tread edge (Te) and the middle block comprises a ground contact surface having an axially outer edge, wherein in the first tire cross-section, a distance from the first thinnest rubber portion to the axially inner edge of the shoulder block is greater than a distance from the first thinnest rubber portion to the axially outer edge of the middle block, wherein the tread portion is further provided with a second block pair comprising a middle block and a central block arranged adjacently to each other in the axial direction of the tire through a second groove bottom having a second thinnest rubber portion at a point on the outer surface of the second groove bottom at which, in a second tire cross-section passing the second block pair, a minimum rubber thickness between the second groove bottom and the inner cavity surface of the tire is provided, or at the middle point of the second groove bottom in the tire axial direction when the rubber thickness between the second groove bottom and the inner cavity is constant, wherein the middle block of the second block pair comprises a ground contact surface having an axially inner edge and the central block comprises a ground contact surface having an axially outer edge, and in the second tire cross-section, a distance from the second thinnest rubber portion to the axially inner edge of the middle block is greater than a distance from the second thinnest rubber portion to the axially outer edge of the central block, characterized in that the shoulder block, the middle block and the central block are arranged adjacently to one another in the axial direction of the tire.