To provide an inner surface grooved pipe made of aluminum allowing fins to be easily formed by grooving without producing aluminum powder in grooving the inner surface.

The inner surface grooved pipe made of aluminum is formed by spirally arranging a large number of fins, wherein the root part of the fin forms a straight line in a cross section perpendicular to a pipe axis, and a space part between the fin and the adjacent fin is formed of a curved surface with a curvature r1 having a center axis within the inner surface grooved pipe in the cross section perpendicular to the pipe axis.