A heat-generating plate comprising: a supporting base material ; a pair of bus bars to which a voltage is applied; and a heat-generating conductor supported by the supporting base material and connected to the pair of bus bars , wherein the heat-generating conductor includes a conductive main thin wire that extends between the pair of bus bars and includes a first large curvature portion and a first small curvature portion , the curvature of the first large curvature portion is larger than the curvature of the first small curvature portion , the cross sectional area of the conductive main thin wire is divided by a lower bottom (S3) having contact with the supporting base material , an upper bottom (S1) arranged at a position facing to the lower bottom (S3), a first inclined portion (S2) extending between one end (E2) of the lower bottom (S3) and one end (E1) of the upper bottom (S1), and a second inclined portion (S4) extending between the other end (E4) of the lower bottom (S3) and the other end (E3) of the upper bottom (S1), and the inclination of the cross sectional area is expressed by each of the inclination of a straight line (T1) passing through the one end (E2) of the lower bottom (S3) and the one end (E1) of the upper bottom (S1) and the inclination of a straight line (T2) passing through the other end (E4) of the lower bottom (S3) and the other end (E3) of the upper bottom (S1), characterised in that the inclination of the cross sectional area of the first large curvature portion of the cross sectional area of the conductive main thin wire is larger than the inclination of the cross sectional area of the first small curvature portion . a supporting base material ; a pair of bus bars to which a voltage is applied; and a heat-generating conductor supported by the supporting base material and connected to the pair of bus bars , wherein the heat-generating conductor includes a conductive main thin wire that extends between the pair of bus bars and includes a first large curvature portion and a first small curvature portion , the curvature of the first large curvature portion is larger than the curvature of the first small curvature portion , the cross sectional area of the conductive main thin wire is divided by a lower bottom (S3) having contact with the supporting base material , an upper bottom (S1) arranged at a position facing to the lower bottom (S3), a first inclined portion (S2) extending between one end (E2) of the lower bottom (S3) and one end (E1) of the upper bottom (S1), and a second inclined portion (S4) extending between the other end (E4) of the lower bottom (S3) and the other end (E3) of the upper bottom (S1), and the inclination of the cross sectional area is expressed by each of the inclination of a straight line (T1) passing through the one end (E2) of the lower bottom (S3) and the one end (E1) of the upper bottom (S1) and the inclination of a straight line (T2) passing through the other end (E4) of the lower bottom (S3) and the other end (E3) of the upper bottom (S1), characterised in that the inclination of the cross sectional area of the first large curvature portion of the cross sectional area of the conductive main thin wire is larger than the inclination of the cross sectional area of the first small curvature portion . <EOS>