A contact member that can contact and be electrically connected to an electrode on a surface of a planar sensor element, the contact member comprising: a first protruding portion configured to be able to contact the surface of the sensor element; and a second protruding portion protruding in the same direction as the first protruding portion and configured to be able to contact the electrode, the first and second protruding portions being formed by bending of metal plate, wherein a protrusion height of the second protruding portion is 90% to 110% of a protrusion height of the first protruding portion, each of said first and second protruding portions (71b, 71c) has a curved protruding shape with (i) a first portion having a concave surface on the side of said metal plate facing away the direction of protrusion of the protruding portion and providing the extremity of the protruding portion and (ii) two curved shoulders respectively on opposite sides of said extremity and each having a convex surface on the side of said metal plate facing away the direction of protrusion of the protruding portion, the curvature radius of said concave surface of said first portion of the first protruding portion is 0.8 mm to 1.6 mm, the curvature radii (R2 and R3) of said convex surfaces of both said curved shoulders of the first protruding portion are 1.2 mm to 2.2 mm, the curvature radius of said concave surface of said first portion of the second protruding portion is 0.8 mm to 1.6 mm, the curvature radii (R5 and R6) of said convex surfaces of both said curved shoulders of the second protruding portion are 1.2 mm to 1.5 mm, and the protrusion heights (H1 and H2) of the first and second protruding portions are 0.1 mm to 1 mm. a first protruding portion configured to be able to contact the surface of the sensor element; and a second protruding portion protruding in the same direction as the first protruding portion and configured to be able to contact the electrode, the first and second protruding portions being formed by bending of metal plate, wherein a protrusion height of the second protruding portion is 90% to 110% of a protrusion height of the first protruding portion, each of said first and second protruding portions (71b, 71c) has a curved protruding shape with (i) a first portion having a concave surface on the side of said metal plate facing away the direction of protrusion of the protruding portion and providing the extremity of the protruding portion and (ii) two curved shoulders respectively on opposite sides of said extremity and each having a convex surface on the side of said metal plate facing away the direction of protrusion of the protruding portion, the curvature radius of said concave surface of said first portion of the first protruding portion is 0.8 mm to 1.6 mm, the curvature radii (R2 and R3) of said convex surfaces of both said curved shoulders of the first protruding portion are 1.2 mm to 2.2 mm, the curvature radius of said concave surface of said first portion of the second protruding portion is 0.8 mm to 1.6 mm, the curvature radii (R5 and R6) of said convex surfaces of both said curved shoulders of the second protruding portion are 1.2 mm to 1.5 mm, and