An apparatus for measuring bio-information, comprising: a pulse wave sensor comprising a housing with a curved contact surface, convex toward a contact surface of an object of interest, and configured to measure one or more pulse wave signals from the object when in contact with the contact surface; a force sensor disposed below or on a side of the pulse wave sensor and configured to measure a contact force of the object; and a processor configured to estimate bio-information of the object on the basis of the one or more measured pulse wave signals and the measured contact force, characterized in that the housing is formed in a semi-cylindrical shape or a hemi-ellipsoid shape having the following dimensions: a first radius of curvature R1, defining a maximum width of the housing in a width direction of the pulse wave sensor , which is not less than 2 mm and not more than 10 mm, a length L, defining a maximum length of the housing in a length direction of the pulse wave sensor that is perpendicular to the width direction, which is less than or equal to 16 mm, and a second radius of curvature R2, defining a maximum height of the housing in a height direction of the pulse wave sensor that is perpendicular to the width direction and length direction, which is not less than 0.5 * R1 and not more than 4 * R1. a pulse wave sensor comprising a housing with a curved contact surface, convex toward a contact surface of an object of interest, and configured to measure one or more pulse wave signals from the object when in contact with the contact surface; a force sensor disposed below or on a side of the pulse wave sensor and configured to measure a contact force of the object; and a processor configured to estimate bio-information of the object on the basis of the one or more measured pulse wave signals and the measured contact force, characterized in that the housing is formed in a semi-cylindrical shape or a hemi-ellipsoid shape having the following dimensions: a first radius of curvature R1, defining a maximum width of the housing in a width direction of the pulse wave sensor , which is not less than 2 mm and not more than 10 mm, a length L, defining a maximum length of the housing in a length direction of the pulse wave sensor that is perpendicular to the width direction, which is less than or equal to 16 mm, and a second radius of curvature R2, defining a maximum height of the housing in a height direction of the pulse wave sensor that is perpendicular to the width direction and length direction, which is not less than 0.5 * R1 and not more than 4 * R1. a first radius of curvature R1, defining a maximum width of the housing in a width direction of the pulse wave sensor , which is not less than 2 mm and not more than 10 mm, a length L, defining a maximum length of the housing in a length direction of the pulse wave sensor that is perpendicular to the width direction, which is less than or equal to 16 mm, and a second radius of curvature R2, defining a maximum height of the housing in a height direction of the pulse wave sensor that is perpendicular to the width direction and length direction, which is not less than 0.5 * R1 and not more than 4 * R1. <EOS>