There is provided an acceleration sensor including: a weight portion; plural fixed portions formed above a bottom plate around a periphery of the weight portion; a beam portion coupling the fixed portions and the weight portion, and holding the weight portion at a position separated from the bottom plate; a detection portion provided at the beam portion and detecting deformation of the beam portion; a frame portion provided so as to project out from the bottom plate and surround the fixed portions at a position separated from the fixed portions; and a lid portion of plate shape that seals an opening of the frame portion.