To provide a MEMS beam structure that can reduce the size of an elastic support portion without reducing the amount of power generation.SOLUTION: A MEMS beam structure 51 includes: a beam portion 510a and a beam portion 510b extending in a y direction orthogonal to an x direction; and a connecting portion 511 for connecting a tip of the beam portion 510b and a tip of the beam portion 510a connected to a coupling portion 52. The beam portions 510a and 510b each have a shape as a beam of equal strength, and a beam root of the beam portion 510a is displaced relative to a beam root of the beam portion 510b in the x direction in accordance with the displacement of the coupling portion 52 in the x direction.SELECTED DRAWING: Figure 2
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