An induction-heating device (1, 51, 61) having a heating coil with a coil winding (4, 5) of the heating coil including at least one wire (4a, 5a), the induction-heating device (1, 51, 61) comprising: a coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55) having a groove part (6c, 7c, 46c, 54c, 55c) capable to accommodate the wire (4a, 5a) at an end of the coil winding (4, 5) and electrically connecting to a control unit for supplying the heating coli with a current; a lid body (9, 10, 29, 30, 39, 40, 58) capable to at least partly be disposed in the groove part (6c, 7c, 46c, 54c, 55c) of the coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55) so as to cover the wire (4a, 5a) of the coil winding (4, 5) accommodated in the groove part (6c, 7c, 46c, 54c, 55c) of the coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55); and a substrate having the coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55) and a unit connection terminal (56, 57) mounted thereon and having a wiring pattern electrically connecting the coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55) and the unit connection terminal (56, 57), wherein the wire (4a, 5a), the coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55), and the lid body (9, 10, 29, 30, 39, 40, 58) are joined together by welding, wherein the welding is performed with the lid body (9, 10, 29, 30, 39, 40, 58) disposed in the groove part (6c, 7c, 46c, 54c, 55c) of the coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55) pressing the wire (4a, 5a) accommodated in the groove part (6c, 7c, 46c, 54c, 55c), and wherein the unit connection terminal (56, 57) is electrically connected to the control unit. a coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55) having a groove part (6c, 7c, 46c, 54c, 55c) capable to accommodate the wire (4a, 5a) at an end of the coil winding (4, 5) and electrically connecting to a control unit for supplying the heating coli with a current; a lid body (9, 10, 29, 30, 39, 40, 58) capable to at least partly be disposed in the groove part (6c, 7c, 46c, 54c, 55c) of the coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55) so as to cover the wire (4a, 5a) of the coil winding (4, 5) accommodated in the groove part (6c, 7c, 46c, 54c, 55c) of the coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55); and a substrate having the coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55) and a unit connection terminal (56, 57) mounted thereon and having a wiring pattern electrically connecting the coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55) and the unit connection terminal (56, 57), wherein the wire (4a, 5a), the coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55), and the lid body (9, 10, 29, 30, 39, 40, 58) are joined together by welding, wherein the welding is performed with the lid body (9, 10, 29, 30, 39, 40, 58) disposed in the groove part (6c, 7c, 46c, 54c, 55c) of the coil connection terminal (6, 7, 8, 26, 27, 36, 37, 46, 54, 55) pressing the wire (4a, 5a) accommodated in the groove part (6c, 7c, 46c, 54c, 55c), and wherein the unit connection terminal (56, 57) is electrically connected to the control unit.