A motorcycle tire for running on rough terrain includes a tread portion. The tread portion includes a base surface and a plurality of blocks. The blocks include a crown block arranged on a tire equator side and a shoulder block arranged on a tread edge side. A height of the shoulder block from the base surface is larger than a height of the crown block from the base surface. The shoulder block is provided on the base surface side with a base portion that has a locally increased cross-section taken along the base surface.