PROBLEM TO BE SOLVED: To enhance accuracy of positioning of a pile underwater, while curtailing a construction period and reducing a construction cost.SOLUTION: A pile center positioning member 1 is for positioning a pile center of a pile 70 installed on a water bottom ground, and includes a concrete template body part 10 of a flat-plate form, the template body part 10 having a guide pipe 21 installed thereon for positioning the pile 70. A plurality of the template body parts 10 is provided, and a steel edge part frame 11 having a flange 11a is formed on an outer peripheral edge part of the template body part. A connecting plate member 33 is overlapped on the flanges 11a, 11a and spanned between the adjacent template body parts 10, 10, and each flange 11a and the connecting plate member 33 are sandwiched by a fitting jig 30, to fix the template body parts 10, 10 to each other.SELECTED DRAWING: Figure 1
