The invention provides electric resistance welded steel pipes or steel tubes with a tensile property TS of not less than 434 MPa which have electric resistance welded parts exhibiting both excellent HIC resistance and excellent low-temperature toughness, and methods for manufacturing such steel pipes or steel tubes. The electric resistance welded steel pipe or steel tube has a controlled chemical composition including, by mass%, C: 0.03 to 0.59%, Si: 0.10 to 0.50%, Mn: 0.40 to 2.10% and Al: 0.01 to 0.35%, the Si content and the Mn content being such that Mn/Si (mass ratio) is in the range of 6.0 to 9.0, the balance being Fe and inevitable impurities, the steel pipe or steel tube having a tensile strength TS of not less than 434 MPa, the steel pipe or steel tube including an electric resistance welded part in which the total amount of silicon, manganese, aluminum, calcium and chromium present in inclusions having an equivalent circle diameter of 8 µm or more is not more than 16 ppm in terms of mass% relative to the total mass of a 2 mm wide portion of the electric resistance welded part including base iron, the electric resistance welded part having both excellent HIC resistance and excellent low-temperature toughness.