A heater connectable with an electric power supply portion (100, 110, 700) having a first terminal and a second terminal (720, 730), said heater comprising: an elongate substrate; a first electric contact provided on said substrate and electrically connectable with the first terminal; a plurality of second electric contacts (651, 661) provided on said substrate and electrically connectable with the second terminal (720, 730); a first electroconductive line extended in a longitudinal direction of said substrate and electrically connected with said first electric contact; a plurality of second electroconductive lines (650, 660a, 660b) extended in the longitudinal direction of said substrate and electrically connected with each said second electric contacts (651, 661); a plurality of electrodes (642, 652, 662) including first electrodes electrically connected with said first electric contact through said electroconductive line and second electrodes (652, 662) electrically connected with said second electric contacts (651, 661), said first electrodes and said second electrodes (652, 662) being arranged alternately with predetermined gaps in the longitudinal direction; and a heat generating layer provided on said substrate so as to electrically connect between adjacent ones of said electrodes (642, 652, 662) and to cover said electrodes (642, 652, 662) and configured to generate heat by electric power supply between adjacent electrodes, wherein said first electroconductive line is provided in one end side beyond said heat generating layer in a widthwise direction of said substrate and all said second electroconductive lines (650, 660a, 660b) are provided in the other end side. an elongate substrate; a first electric contact provided on said substrate and electrically connectable with the first terminal; a plurality of second electric contacts (651, 661) provided on said substrate and electrically connectable with the second terminal (720, 730); a first electroconductive line extended in a longitudinal direction of said substrate and electrically connected with said first electric contact; a plurality of second electroconductive lines (650, 660a, 660b) extended in the longitudinal direction of said substrate and electrically connected with each said second electric contacts (651, 661); a plurality of electrodes (642, 652, 662) including first electrodes electrically connected with said first electric contact through said electroconductive line and second electrodes (652, 662) electrically connected with said second electric contacts (651, 661), said first electrodes and said second electrodes (652, 662) being arranged alternately with predetermined gaps in the longitudinal direction; and a heat generating layer provided on said substrate so as to electrically connect between adjacent ones of said electrodes (642, 652, 662) and to cover said electrodes (642, 652, 662) and configured to generate heat by electric power supply between adjacent electrodes, wherein said first electroconductive line is provided in one end side beyond said heat generating layer in a widthwise direction of said substrate and all said second electroconductive lines (650, 660a, 660b) are provided in the other end side.