A heater for use in an image heating device, the heater comprising: a substrate; a first heating block provided on the substrate and configured to generate heat by an electric power supplied thereto; a second heating block provided at a position different from the position of the first heating block in a longitudinal direction of the substrate and configured to be controllable separately from the first heating block; characterized in that the heater further comprises a third heating block provided at a position different from the positions of the first and second heating blocks (HB1, HB2) in the longitudinal direction of the substrate and configured to generate heat with the first heating block simultaneously; a fourth heating block provided at a position different from the positions of the first, second and third heating blocks (HB1, HB2, HB7) in the longitudinal direction of the substrate and configured to generate heat with the second heating block simultaneously; a first temperature sensor (T1-1) provided at a position corresponding to the first heating block; a second temperature sensor (T1-2) provided at a position corresponding to the second heating block; a third temperature sensor (T2-7) provided at a position corresponding to the third heating block; a fourth temperature sensor (T2-6) provided at a position corresponding to the fourth heating block; a first conductive pattern (ET1-1) electrically coupled to the first temperature sensor (T1-1); a second conductive pattern (ET1-2) electrically coupled to the second temperature sensor (T1-2); and a first common conductive pattern electrically coupled to the first and second temperature sensors (T1-1, T1-2); a third conductive pattern (ET2-7) electrically coupled to the third temperature sensor (T2-7); a fourth conductive pattern (ET2-6) electrically coupled to the fourth temperature sensor (T2-6); and a second common conductive pattern electrically coupled to the third and fourth temperature sensors (T2-7, T2-6), wherein each of the heating blocks (HB1, HB2, HB7, HB6) includes: a heat generating member provided on one surface of the substrate and configured to generate heat from electric power supplied thereto; and an electrode (E2,E3,E4,E5,E6) in contact with an electric contact (C2,C3,C4,C5,C6) for supplying electric power to the heat generating member, wherein the electrode is provided in an area where the heat generating member is provided in the longitudinal direction on the one surface of the substrate. a substrate; a first heating block provided on the substrate and configured to generate heat by an electric power supplied thereto; a second heating block provided at a position different from the position of the first heating block in a longitudinal direction of the substrate and configured to be controllable separately from the first heating block; characterized in that the heater further comprises a third heating block provided at a position different from the positions of the first and second heating blocks (HB1, HB2) in the longitudinal direction of the substrate and configured to generate heat with the first heating block simultaneously; a fourth heating block provided at a position different from the positions of the first, second and third heating blocks (HB1, HB2, HB7) in the longitudinal direction of the substrate and configured to generate heat with the second heating block simultaneously; a first temperature sensor (T1-1) provided at a position corresponding to the first heating block; a second temperature sensor (T1-2) provided at a position corresponding to the second heating block; a third temperature sensor (T2-7) provided at a position corresponding to the third heating block; a fourth temperature sensor (T2-6) provided at a position corresponding to the fourth heating block; a first conductive pattern (ET1-1) electrically coupled to the first temperature sensor (T1-1); a second conductive pattern (ET1-2) electrically coupled to the second temperature sensor (T1-2); and a first common conductive pattern electrically coupled to the first and second temperature sensors (T1-1, T1-2); a third conductive pattern (ET2-7) electrically coupled to the third temperature sensor (T2-7); a fourth conductive pattern (ET2-6) electrically coupled to the fourth temperature sensor (T2-6); and a second common conductive pattern electrically coupled to the third and fourth temperature sensors (T2-7, T2-6), wherein each of the heating blocks (HB1, HB2, HB7, HB6) includes: a heat generating member provided on one surface of the substrate and configured to generate heat from electric power supplied thereto; and an electrode (E2,E3,E4,E5,E6) in contact with an electric contact (C2,C3,C4,C5,C6) for supplying electric power to the heat generating member, wherein the electrode is provided in an area where the heat generating member is provided in the longitudinal direction on the one surface of the substrate. a heat generating member provided on one surface of the substrate and configured to generate heat from electric power supplied thereto; and an electrode (E2,E3,E4,E5,E6) in contact with an electric contact (C2,C3,C4,C5,C6) for supplying electric power to the heat generating member, wherein the electrode is provided in an area where the heat generating member is provided in the longitudinal direction on the one surface of the substrate.