A fixing apparatus configured to fix an unfixed toner image borne on a recording material, the fixing apparatus comprising a heater including a heat generating element (42a, 42b, 54bla, 54blb) having a first area (A, F), a second area (B, G), and a third area (C, H), the first area (A, F) being located on an end portion side in an orthogonal direction orthogonal to a conveyance direction of the recording material and having a first heat generation amount per unit length in the orthogonal direction, the second area (B, G) being adjacent to the first area (A, F) in the orthogonal direction and having a second heat generation amount per unit length in the orthogonal direction, the third area (C, H) being adjacent to the second area (B, G) in the orthogonal direction and having a third heat generation amount per unit length in the orthogonal direction, wherein the second heat generation amount is larger than the third heat generation amount, and the third heat generation amount is larger than the first heat generation amount, wherein the first area (A, F) has a first length (L1, L6) in the orthogonal direction, wherein the second area (B, G) has a second length (L2, L7) in the orthogonal direction, wherein the third area (C, H) has a third length (L3, L8) in the orthogonal direction, wherein the third length (L3, L8) is larger than the second length (L2, L7), and the second length (L2, L7) is larger than the first length (L1, L6), wherein the first area (A, F) has a first width (H1, H6) in the conveyance direction, wherein the second area (B, G) has a second width (H2, H7) in the conveyance direction, wherein the third area (C, H) has a third width (H3, H8) in the conveyance direction, and wherein the first area (A, F), the second area (B, G), and the third area (C, H) of the heat generating element (42a, 42b, 54bla, 54blb) are arranged in the orthogonal direction in order of the first area (A, F), the second area (B, G), the third area (C, H), the second area (B, G), and the first area (A, F), characterized in that respective one sides of the first area (A, F), the second area (B, G), and the third area (C, H) are lined up as a straight line, and respective positions of the other sides change so that the first width (H1, H6) is larger than the third width (H3, H8), and the third width (H3, H8) is larger than the second width (H2, H7). wherein the second heat generation amount is larger than the third heat generation amount, and the third heat generation amount is larger than the first heat generation amount, wherein the first area (A, F) has a first length (L1, L6) in the orthogonal direction, wherein the second area (B, G) has a second length (L2, L7) in the orthogonal direction, wherein the third area (C, H) has a third length (L3, L8) in the orthogonal direction, wherein the third length (L3, L8) is larger than the second length (L2, L7), and the second length (L2, L7) is larger than the first length (L1, L6), wherein the first area (A, F) has a first width (H1, H6) in the conveyance direction, wherein the second area (B, G) has a second width (H2, H7) in the conveyance direction, wherein the third area (C, H) has a third width (H3, H8) in the conveyance direction, and wherein the first area (A, F), the second area (B, G), and the third area (C, H) of the heat generating element (42a, 42b, 54bla, 54blb) are arranged in the orthogonal direction in order of the first area (A, F), the second area (B, G), the third area (C, H), the second area (B, G), and the first area (A, F),