Abstract: A biosignal sensor includes a substrate, first light-emitting elements, second light-emitting elements, and light-receiving elements. The light-receiving elements are positioned individually spaced apart by different distances from the first light-emitting elements and the second light-emitting elements and receive light from the first light-emitting elements and the second light-emitting elements. The plurality of light-receiving elements are linearly or substantially linearly aligned in an X direction. The first light-emitting elements and the second light-emitting elements are located at positions different in a Y direction from positions of the plurality of light-receiving elements.

Abstract: A light-emitting element and a light-receiving element are provided on a surface of a substrate. The light-emitting element and the light-receiving element are sealed by transparent resin members and, respectively. A lens is provided at the transparent resin member at a position above the light-emitting element. The center of the lens and a mounting position of the light-emitting element are disposed being shifted from each other. With this, an optical axis of light outputted via the lens is slanted toward an opposite direction side with respect to the light-receiving element at a predetermined elevation angle. In this case, a beam divergence angle of light outputted from the lens is set to a predetermined value.

Abstract: A light-emitting element and a light-receiving element are provided on a surface of a substrate. The light-emitting element and the light-receiving element are sealed by transparent resin members and, respectively. A lens is provided at the transparent resin member at a position above the light-emitting element. The center of the lens and a mounting position of the light-emitting element are disposed being shifted from each other. With this, an optical axis of light outputted via the lens is slanted toward an opposite direction side with respect to the light-receiving element at a predetermined elevation angle. In this case, a beam divergence angle of light outputted from the lens is set to a predetermined value.

Abstract: Three light emitting elements and one light receiving element are provided on a surface of a substrate. The light receiving element is disposed within a first triangular region connecting the three light emitting elements. A first rectangle circumscribed around the triangular region is formed. In addition, a second rectangle circumscribed around a second triangle formed when intersections of a virtually set XY plane and optical axes of light beams emitted from the three light emitting elements are perpendicularly projected on the surface of the substrate, is formed. Directions of the light emitted from the three light emitting elements are set such that at least either one of length and breadth dimensions of the second rectangle is larger than a corresponding one of length and breadth dimensions of the first rectangle.

Abstract: Three light emitting elements and one light receiving element are provided on a surface of a substrate. The light receiving element is disposed within a first triangular region connecting the three light emitting elements. A first rectangle circumscribed around the triangular region is formed. In addition, a second rectangle circumscribed around a second triangle formed when intersections of a virtually set XY plane and optical axes of light beams emitted from the three light emitting elements are perpendicularly projected on the surface of the substrate, is formed. Directions of the light emitted from the three light emitting elements are set such that at least either one of length and breadth dimensions of the second rectangle is larger than a corresponding one of length and breadth dimensions of the first rectangle.