The present invention relates to a three-axis acceleration sensor based on a MEMS sensor, and more particularly, to a three-axis acceleration sensor based on a MEMS sensor. A y-axis sensor mass for sensing an external acceleration input in a second axis direction parallel to the bottom wafer substrate and perpendicular to the first axis; And a z-axis sensor mass formed to surround the x-axis sensor mass and the y-axis sensor mass, respectively, for sensing an external acceleration inputted in a third axis direction perpendicular to the bottom wafer substrate, While sensing the independent motion of each axis sensor mass and measuring the three axis direction acceleration.
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