Abstract: An acceleration detecting portion that detects an acceleration in a predetermined direction and an offset detecting portion that detects an offset amount with respect to the acceleration detecting portion are included. The offset detecting portion includes a second semiconductor substrate with a second cavity formed in its interior, a second fixed structure including a second fixed electrode that is supported, in a state of floating with respect to the second cavity, by the second semiconductor substrate, a second movable structure including a second movable electrode that is supported, in a state of floating with respect to the second cavity, by the second semiconductor substrate, and a disabling structure that disables a function of the second movable electrode displacing with respect to the second fixed electrode.

Abstract: An acceleration sensor includes a semiconductor substrate that has a cavity formed in an interior, a fixed structure that includes a fixed electrode supported by the semiconductor substrate in a state of floating with respect to the cavity, and a movable structure that includes a movable electrode supported by the semiconductor substrate via an elastic structure in a state of floating with respect to the cavity and displacing with respect to the fixed electrode. The elastic structure includes a first end portion supported by the semiconductor substrate, a second end portion connected to the movable structure, and an intermediate portion connecting the first end portion and the second end portion and has a rectilinearly-extending rectilinear portion at least at a portion of the intermediate portion and the rectilinear portion includes a plurality of rectilinear frames extending in parallel to each other in a direction in which the rectilinear portion extends.

Abstract: [Problem] To provide a pulse sensor capable of accurately measuring the pulse of a subject. [Solution] A pulse sensor (600) has: a housing (610) mounted to an external ear; an optical sensor unit (620) which is disposed upon the housing (610) and acquires pulse data by emitting light from a light-emitting portion onto the external ear and detecting, at a light-receiving unit, the intensity of the light that is transmitted through a living body and returns; and a buffer member (630) which is disposed between the housing (610) and the optical sensor unit (620).

Abstract: [Problem] To provide a pulse sensor capable of accurately measuring the pulse of a subject. [Solution] A pulse sensor (600) has: a housing (610) mounted to an external ear; an optical sensor unit (620) which is disposed upon the housing (610) and acquires pulse data by emitting light from a light-emitting portion onto the external ear and detecting, at a light-receiving unit, the intensity of the light that is transmitted through a living body and returns; and a buffer member (630) which is disposed between the housing (610) and the optical sensor unit (620).