A force sensor, comprising: a first surface and a second surface facing each other in a first direction (Z1, Z2); a first protrusion protruded from the first surface toward the second surface; a first electrode on the first protrusion ; a first force sensing layer on the first electrode ; a second protrusion protruded from the second surface toward the first surface; and a second electrode on the second protrusion , wherein the first protrusion and the second protrusion are not overlapped with each other or are partially overlapped with each other, wherein a center of the first protrusion is spaced apart from a center of the second protrusion in a second direction (X1, X2) perpendicular to the first direction, the force sensor further comprising: a first opening (OP1) on the first surface, wherein the first electrode and the first force sensing layer are not disposed in the first opening (OP1); a second opening (OP2) on the second surface, wherein the second electrode is not disposed in the second opening (OP2), wherein the center of the second protrusion overlaps with the first opening (OP1), and the center of the first protrusion overlaps with the second opening (OP2); and wherein the first protrusion is spaced apart from the second surface and the second protrusion is spaced apart from the first surface when the force sensor is not pressed. a first surface and a second surface facing each other in a first direction (Z1, Z2); a first protrusion protruded from the first surface toward the second surface; a first electrode on the first protrusion ; a first force sensing layer on the first electrode ; a second protrusion protruded from the second surface toward the first surface; and a second electrode on the second protrusion , wherein the first protrusion and the second protrusion are not overlapped with each other or are partially overlapped with each other, wherein a center of the first protrusion is spaced apart from a center of the second protrusion in a second direction (X1, X2) perpendicular to the first direction, the force sensor further comprising: a first opening (OP1) on the first surface, wherein the first electrode and the first force sensing layer are not disposed in the first opening (OP1); a second opening (OP2) on the second surface, wherein the second electrode is not disposed in the second opening (OP2), wherein the center of the second protrusion overlaps with the first opening (OP1), and the center of the first protrusion overlaps with the second opening (OP2); and wherein the first protrusion is spaced apart from the second surface and the second protrusion is spaced apart from the first surface when the force sensor is not pressed. a first opening (OP1) on the first surface, wherein the first electrode and the first force sensing layer are not disposed in the first opening (OP1); a second opening (OP2) on the second surface, wherein the second electrode is not disposed in the second opening (OP2), wherein the center of the second protrusion overlaps with the first opening (OP1), and the center of the first protrusion overlaps with the second opening (OP2); and wherein the first protrusion is spaced apart from the second surface and the second protrusion is spaced apart from the first surface when the force sensor is not pressed. <EOS>