An acceleration sensor comprising: a frame having a hollow space at an inside thereof; first beams extending to the hollow space, the first beams having one ends and other ends opposite to the one ends of the first beams, the one ends of the first beams being connected to the frame; second beams extending to the hollow space, the second beams having one ends and other ends opposite to the one ends of the second beams, the one ends of the second beams being connected to the frame; third beams extending to the hollow space, the third beams having one ends and other ends opposite to the one ends of the third beams, the one ends of the third beams being connected to the frame; fourth beams extending to the hollow space, the fourth beams having one ends and other ends opposite to the one ends of the fourth beams, the one ends of the fourth beams being connected to the frame; a first plummet connected to the other ends of the first beams; a second plummet connected to the other ends of the second beams; a third plummet connected to the other ends of the third beams; a fourth plummet connected to the other ends of the fourth beams; a first sensing unit disposed at the first beams; a second sensing unit disposed at the second beams; a third sensing unit disposed at the third beams; a fourth sensing unit disposed at the fourth beams; wherein the one ends of the first beams and the one ends of the second beams are connected to respective one of portions of the frame opposite to each other with respect to the hollow space, wherein the first plummet faces the second plummet across a center of the hollow space, wherein the one ends of the third beams and the one ends of the fourth beams are connected to respective one of portions of the frame opposite to each other with respect to the hollow space, and wherein the third plummet faces the fourth plummet across the center of the hollow space, wherein the first beams, the second beams, the third beams and the fourth beams are respectively a first pair of beams, a second pair of beams, a third pair of beams and fourth pair of beams, and the acceleration sensor further comprises: a fifth beam extending to the hollow space, the fifth beam having one end and another end opposite to the one end of the fifth beam, the one end of the fifth beam being connected to the frame; a sixth beam extending to the hollow space, the sixth beam having one end and another end opposite to the one end of the sixth beam, the one end of the sixth beam being connected to the frame; wherein the another end of the fifth beam is a free end and the another end of the sixth beam is a free end, wherein the fifth beam is provided between the two beams of the third pair of beams and the sixth beam is provided between the two beams of the fourth pair of beams, wherein a fifth sensing unit is disposed at the fifth beam and a sixth sensing unit is disposed at the sixth beam. a frame having a hollow space at an inside thereof; first beams extending to the hollow space, the first beams having one ends and other ends opposite to the one ends of the first beams, the one ends of the first beams being connected to the frame; second beams extending to the hollow space, the second beams having one ends and other ends opposite to the one ends of the second beams, the one ends of the second beams being connected to the frame; third beams extending to the hollow space, the third beams having one ends and other ends opposite to the one ends of the third beams, the one ends of the third beams being connected to the frame; fourth beams extending to the hollow space, the fourth beams having one ends and other ends opposite to the one ends of the fourth beams, the one ends of the fourth beams being connected to the frame; a first plummet connected to the other ends of the first beams; a second plummet connected to the other ends of the second beams; a third plummet connected to the other ends of the third beams; a fourth plummet connected to the other ends of the fourth beams; a first sensing unit disposed at the first beams; a second sensing unit disposed at the second beams; a third sensing unit disposed at the third beams; a fourth sensing unit disposed at the fourth beams; wherein the one ends of the first beams and the one ends of the second beams are connected to respective one of portions of the frame opposite to each other with respect to the hollow space, wherein the first plummet faces the second plummet across a center of the hollow space, wherein the one ends of the third beams and the one ends of the fourth beams are connected to respective one of portions of the frame opposite to each other with respect to the hollow space, and wherein the third plummet faces the fourth plummet across the center of the hollow space, wherein the first beams, the second beams, the third beams and the fourth beams are respectively a first pair of beams, a second pair of beams, a third pair of beams and fourth pair of beams, a fifth beam extending to the hollow space, the fifth beam having one end and another end opposite to the one end of the fifth beam, the one end of the fifth beam being connected to the frame; a sixth beam extending to the hollow space, the sixth beam having one end and another end opposite to the one end of the sixth beam, the one end of the sixth beam being connected to the frame; wherein the another end of the fifth beam is a free end and the another end of the sixth beam is a free end, wherein the fifth beam is provided between the two beams of the third pair of beams and the sixth beam is provided between the two beams of the fourth pair of beams,