The MEMS sensor according to the present invention includes: a substrate; a supporting portion provided on one surface of the substrate; a beam, supported by the supporting portion, having a movable portion opposed to the surface of the substrate through a space; a resistor formed on at least the movable portion of the beam; a weight arranged on a side of the beam opposite to the substrate; and a coupling portion, made of a metallic material, coupling the beam and the weight with each other.