The tower presents tetragonal form with a bastion at each of its corners. The material is sandstone masonry and in many areas you can see the marks of the masons own time. In 1662 began the second fase of the construction; the fortress has a trapezoidal shape with four large bastions that give this peculiar way. In the nineteenth century, it suffered the 3rd and last major reform to form a coastal battery with four guns Ordoñez a 24 on the outside.