The invention concerns a device for securing an insert in a structure having a first opening, the insert having a principal body (20) inserted in the first opening, the body (20) having a second opening having a principal axis, the device including a shaft (23) designed to pass through the second opening and at least one detachable or non-detachable head (24, 42).According to the invention, this device includes at least one roughly planar part (25, 26, 43) having a third opening, the part being designed to be positioned on an outer face of the structure (21, 22) so that the third opening is centered on the second opening for the passage of the shaft (23), the part (25, 26, 43) locking the insert in the first opening, a system for blocking the part (25, 26, 43) from rotating relative to the principal body (20), and an element for joining the head onto the part (25, 26, 43) for locking the head onto the part, the head being designed to be supported against the part (25, 26, 43) to secure the part against the outer surface.