A to-be-cooled body protection structure arranged on a saddle-ridden vehicle, in which a to-be-cooled body requiring cooling with a travelling air is supported to a body frame including a front fork and a head pipe at a front end portion of the body frame, the front fork journaling a front wheel, the head pipe steerably supporting a steering handlebar, and a guard member straddles over a pair of left and right frame members configuring a part of the body frame, the guard member being supported to the body frame and located at a rear of the front wheel in the center of the vehicle width direction so as to protect at least a front portion of the to-be-cooled body, wherein a first plurality of through-holes (61, 62, 63, 64, 65, 66, 67, 68) are provided on the guard member, a second plurality of through-holes (61 to 66) as part of the first plurality of through-holes (61 to 68) each include at least one linear edge portion (61a, 61b; 62a, 62b, 62c; 63a, 63b, 63c; 64a, 64b, 64c; 65a, 65b, 65c; 66a, 66b) linearly extending, and are formed into non-circular shapes, and the non-circular through-holes (61 to 66) are arranged such that linear ribs (70, 73, 71, 74, 72) are formed between linear edge portions (61a, 62a; 62b, 63b; 63a, 64a; 64b, 65b; 65a, 66a), as said linear edge portion, facing each other of adjacent ones of the non-circular through-holes, characterized in that the non-circular through-holes (61 to 66) are formed into triangles each having three linear edge portions (61a, 61b; 62a, 62b, 62c; 63a, 63b, 63c; 64a, 64b, 64c; 65a, 65b, 65c; 66a, 66b) as said linear edge portion, and linear edge portions (61a, 62a, 63a, 64a, 65a, 66a), as said linear edge portion, corresponding to long sides of the triangles of adjacent ones of the triangular through-holes (61 to 66) are located so as to face each other, the guard member includes a center rib linearly extending at a center portion in a vehicle width direction, and among three linear edge portions (61a, 61b; 63a, 63b, 63c; 65a, 65b, 65c) provided in each of the through-holes (61, 63, 65) selected among the second plurality of triangular through-holes (61 to 66), remaining linear edge portions (61b, 63c, 65c) excluding linear edge portions (61a; 63a, 63b; 65a, 65b) facing one another of adjacent ones of the selected triangular through-holes are located along the center rib. wherein a first plurality of through-holes (61, 62, 63, 64, 65, 66, 67, 68) are provided on the guard member, a second plurality of through-holes (61 to 66) as part of the first plurality of through-holes (61 to 68) each include at least one linear edge portion (61a, 61b; 62a, 62b, 62c; 63a, 63b, 63c; 64a, 64b, 64c; 65a, 65b, 65c; 66a, 66b) linearly extending, and are formed into non-circular shapes, and the non-circular through-holes (61 to 66) are arranged such that linear ribs (70, 73, 71, 74, 72) are formed between linear edge portions (61a, 62a; 62b, 63b; 63a, 64a; 64b, 65b; 65a, 66a), as said linear edge portion, facing each other of adjacent ones of the non-circular through-holes, characterized in that the non-circular through-holes (61 to 66) are formed into triangles each having three linear edge portions (61a, 61b; 62a, 62b, 62c; 63a, 63b, 63c; 64a, 64b, 64c; 65a, 65b, 65c; 66a, 66b) as said linear edge portion, and linear edge portions (61a, 62a, 63a, 64a, 65a, 66a), as said linear edge portion, corresponding to long sides of the triangles of adjacent ones of the triangular through-holes (61 to 66) are located so as to face each other, the guard member includes a center rib linearly extending at a center portion in a vehicle width direction, and among three linear edge portions (61a, 61b; 63a, 63b, 63c; 65a, 65b, 65c) provided in each of the through-holes (61, 63, 65) selected among the second plurality of triangular through-holes (61 to 66), remaining linear edge portions (61b, 63c, 65c) excluding linear edge portions (61a; 63a, 63b; 65a, 65b) facing one another of adjacent ones of the selected triangular through-holes are located along the center rib.