A seed crystal substrate 8 includes a base body 1 and a plurality of rows of stripe-shaped seed crystal layers 3 formed on the base body 1. An upper face 3a of the seed crystal layer 3 is (11-22) plane, a groove 4 is formed between the adjacent seed crystal layers 3, and a longitudinal direction of the groove 4 is a direction in which a c-axis of a crystal forming the seed crystal layer is projected on the upper face. A nitride of a group 13 element is formed on the seed crystal substrate.