An air conditioner, comprising: a blowing fan including a suction port; a bell mouth formed along a circumferential direction of the suction port; and a fan guard (100, 200) extending from an inner circumferential surface of the bell mouth and covering the suction port; wherein the fan guard comprises a plurality of annular ribs concentrically arranged with a gap from a center of the fan guard corresponding to a rotation axis of the blowing fan, wherein the plurality of annular ribs comprises a first annular rib adjacent to an outermost edge of the fan guard and a second annular rib arranged further inside than the first annular rib in a radial direction of the fan guard and a third annular rib arranged further inside than the second annular rib in the radial direction of the fan guard and fourth annular rib arranged further inside than the third annular rib in the radial direction of the fan guard, characterized in that the first annular rib is arranged to be inclined to a direction of the rotation axis in a direction corresponding to a tangent line (t) of the bell mouth, wherein a gap between the first annular rib and the second annular rib is set to be narrower than a gap between any annular ribs arranged adjacent to the center of the fan guard, wherein one of the first annular rib and the second annular rib comprises a plurality of protruding ribs protruding to the other one of the first annular rib and the second annular rib in the radial direction of the fan guard, wherein a distance between the first annular rib and the second annular rib is set to be equal to or greater than a distance between the second annular rib and the third annular rib and a distance between the third annular rib and the fourth annular rib, wherein a distance between the second annular rib and the third annular rib is set to be equal to or greater than the distance between the third annular rib and the fourth annular rib, and wherein a height of each of the plurality of protruding ribs is smaller than the distance between the first annular rib and the second annular rib. a blowing fan including a suction port; a bell mouth formed along a circumferential direction of the suction port; and a fan guard (100, 200) extending from an inner circumferential surface of the bell mouth and covering the suction port; wherein the fan guard comprises a plurality of annular ribs concentrically arranged with a gap from a center of the fan guard corresponding to a rotation axis of the blowing fan, wherein the plurality of annular ribs comprises a first annular rib adjacent to an outermost edge of the fan guard and a second annular rib arranged further inside than the first annular rib in a radial direction of the fan guard and a third annular rib arranged further inside than the second annular rib in the radial direction of the fan guard and fourth annular rib arranged further inside than the third annular rib in the radial direction of the fan guard, characterized in that the first annular rib is arranged to be inclined to a direction of the rotation axis in a direction corresponding to a tangent line (t) of the bell mouth, wherein a gap between the first annular rib and the second annular rib is set to be narrower than a gap between any annular ribs arranged adjacent to the center of the fan guard, wherein one of the first annular rib and the second annular rib comprises a plurality of protruding ribs protruding to the other one of the first annular rib and the second annular rib in the radial direction of the fan guard, wherein a distance between the first annular rib and the second annular rib is set to be equal to or greater than a distance between the second annular rib and the third annular rib and a distance between the third annular rib and the fourth annular rib, wherein a distance between the second annular rib and the third annular rib is set to be equal to or greater than the distance between the third annular rib and the fourth annular rib, and wherein a height of each of the plurality of protruding ribs is smaller than the distance between the first annular rib and the second annular rib.