To provide a rotary-penetration steel pipe pile which exerts penetration performance of good efficiency.

In a first embodiment, the rotary-penetration steel pipe pile 1 is formed of: a hollow cylindrical steel pipe pile main body 2 having a predetermined diameter; and two blades 3a, 3b which are mounted on the tip of the steel pipe pile main body in a manner being inclined in the same direction with respect to a rotating direction of the steel pipe pile main body. The rotary-penetration steel pipe pile is characterized by arranging an excavating blade at the center of the two blades 3a, 3b along a boundary between the two blades in a manner protruding in a penetration direction of the steel pipe pile. In a second embodiment, the rotary-penetration steel pipe pile is characterized by forming a rhomboid opening defined by the two blades, at the center between the same.