A post fastener with a long lifespan due to fast fastening speed and good durability by connecting several posts with a minimum of fasteners is disclosed. The disclosed post fastener is such that the first post and the second post are pressed and fixed together in a state in which they are in contact with each other in a transverse direction, forming a first insertion space into which the first post is inserted in the longitudinal direction, and the first a first regulating unit located on both sides of the strut for regulating the movement in both directions of the first strut; a second regulating part forming a second insertion space into which the second strut is inserted in the transverse direction, extending from the first regulating part, and positioned on both sides of the second strut to regulate the movement of the second strut in both directions; a first clamp positioned on the side of the first regulating unit and having a first pressing unit for fixing and pressing the second post and the first post; a third regulating unit to be fixed in a pressurized state, to form a third insertion space into which the third strut is inserted, and to be positioned on both sides of the third strut to regulate the movement in both directions; a second clamp having a second pressing part positioned on the third regulating part to press the third post; and a fastening part installed between the first clamp and the second clamp to rotatably support the second clamp with respect to the first clamp so that the third post is disposed at a predetermined inclination with respect to the first post.
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