A head-gimbal assembly (HGA). The HGA includes a deformable plate affixed to a load beam, a piezoelectric element affixed to the deformable plate, and a base plate affixed to the deformable plate. The deformable plate includes: a hole; a first section in front of the hole and affixed to the load beam; a second section behind the hole and affixed to the base plate; and, first and second spring members that join the first section and the second section, can deform in a front-back direction, and are positioned to sandwich the hole in a left-right direction. The piezoelectric element is affixed between the first section and the second section. The base plate includes projection members on a front edge of the plate and projecting out toward the first section. The front edges of the projection member are positioned further to a front edge than a back edge of the hole.