A pulse wave detector comprising: a pressure pulse wave sensor (10, 12) including: sensor chips each having an element row including a plurality of pressure detection elements arranged in one direction; a substrate to which the sensor chips are respectively fixed; a protection member for protecting the substrate and the sensor chips; an air bag; a rotation driving section fixed to the air bag and rotatably supporting the pressure pulse wave sensor (10, 12); and a filling material being filled in a space between detection faces of the sensor chips on which the pressure detection elements are formed and opening sections provided in the protection member, the opening sections being disposed on a side opposite to a side of the sensor chips to which the substrate is fixed and being disposed at positions opposed to the detection faces in a vertical direction perpendicular to the detection faces, wherein the rotation driving section includes a rotation mechanism for rotating the pressure pulse wave sensor (10, 12) around a direction orthogonal to each of the one direction and the vertical direction, wherein an outer peripheral face of the protection member includes: a top face in which the opening sections are formed; and inclined faces that continue to both edges in the one direction of the top face and are inclined with respect to opening faces of the opening sections, inclination angles (θ) of the inclined faces with respect to the opening faces being set to a value greater than a maximum value of a rotation angle of the pressure pulse wave sensor (10, 12) capable of being rotated by the rotation mechanism. a pressure pulse wave sensor (10, 12) including: sensor chips each having an element row including a plurality of pressure detection elements arranged in one direction; a substrate to which the sensor chips are respectively fixed; a protection member for protecting the substrate and the sensor chips; an air bag; a rotation driving section fixed to the air bag and rotatably supporting the pressure pulse wave sensor (10, 12); and a filling material being filled in a space between detection faces of the sensor chips on which the pressure detection elements are formed and opening sections provided in the protection member, the opening sections being disposed on a side opposite to a side of the sensor chips to which the substrate is fixed and being disposed at positions opposed to the detection faces in a vertical direction perpendicular to the detection faces, sensor chips each having an element row including a plurality of pressure detection elements arranged in one direction; a substrate to which the sensor chips are respectively fixed; a protection member for protecting the substrate and the sensor chips; an air bag; a rotation driving section fixed to the air bag and rotatably supporting the pressure pulse wave sensor (10, 12); and a filling material being filled in a space between detection faces of the sensor chips on which the pressure detection elements are formed and opening sections provided in the protection member, the opening sections being disposed on a side opposite to a side of the sensor chips to which the substrate is fixed and being disposed at positions opposed to the detection faces in a vertical direction perpendicular to the detection faces, wherein the rotation driving section includes a rotation mechanism for rotating the pressure pulse wave sensor (10, 12) around a direction orthogonal to each of the one direction and the vertical direction, wherein an outer peripheral face of the protection member includes: a top face in which the opening sections are formed; and inclined faces that continue to both edges in the one direction of the top face and are inclined with respect to opening faces of the opening sections, inclination angles (θ) of the inclined faces with respect to the opening faces being set to a value greater than a maximum value of a rotation angle of the pressure pulse wave sensor (10, 12) capable of being rotated by the rotation mechanism. a top face in which the opening sections are formed; and inclined faces that continue to both edges in the one direction of the top face and are inclined with respect to opening faces of the opening sections, inclination angles (θ) of the inclined faces with respect to the opening faces being set to a value greater than a maximum value of a rotation angle of the pressure pulse wave sensor (10, 12) capable of being rotated by the rotation mechanism.