Resistance-welding equipment comprising an equipment main body including: a pair of upper and lower welding electrodes (5a, 5b) provided so as to be movable up and down and configured to weld a workpiece interposed therebetween with a current applied thereto; a pressing unit configured to press the workpiece via the upper and lower welding electrodes during the welding; and an intermediate electrode set disposed between the upper and lower welding electrodes and provided at at least one of the upper and lower welding electrode sides, wherein the intermediate electrode set includes a plurality of intermediate units, each intermediate unit having an intermediate electrode set jig and an intermediate electrode attachable to and detachable from the intermediate electrode set jig, and is configured as a rotary type in which the plurality of intermediate units are provided so as to be rotatable in a circumferential direction such that the plurality of intermediate units sequentially stop at a welding position that is aligned with the upper and lower welding electrodes in an up-down direction, and the intermediate electrode set is configured to resistance-weld the workpiece, while pressing the workpiece by the pressing unit, via the intermediate electrode of the intermediate unit at the welding position; being characterised in that the welding electrode (5a, 5b) has an electrode portion configured to surface-contact a power supply surface of the intermediate electrode such that electric power is supplied from the welding electrode to the intermediate electrode, and dimensions of a diameter D of the power supply surface of each intermediate electrode and a height H of each intermediate electrode satisfy D/H≥1/1.2. a pair of upper and lower welding electrodes (5a, 5b) provided so as to be movable up and down and configured to weld a workpiece interposed therebetween with a current applied thereto; a pressing unit configured to press the workpiece via the upper and lower welding electrodes during the welding; and an intermediate electrode set disposed between the upper and lower welding electrodes and provided at at least one of the upper and lower welding electrode sides, wherein the intermediate electrode set includes a plurality of intermediate units, each intermediate unit having an intermediate electrode set jig and an intermediate electrode attachable to and detachable from the intermediate electrode set jig, and is configured as a rotary type in which the plurality of intermediate units are provided so as to be rotatable in a circumferential direction such that the plurality of intermediate units sequentially stop at a welding position that is aligned with the upper and lower welding electrodes in an up-down direction, and the intermediate electrode set is configured to resistance-weld the workpiece, while pressing the workpiece by the pressing unit, via the intermediate electrode of the intermediate unit at the welding position; being characterised in that the welding electrode (5a, 5b) has an electrode portion configured to surface-contact a power supply surface of the intermediate electrode such that electric power is supplied from the welding electrode to the intermediate electrode, and dimensions of a diameter D of the power supply surface of each intermediate electrode and a height H of each intermediate electrode satisfy D/H≥1/1.2.