ELECTRIC RESISTANCE WELDED STEEL PIPE, METHOD FOR PRODUCING SAME, AND STRUCTURAL MEMBER FOR AUTOMOBILE

An electric resistance welded steel pipe having excellent formability and torsional fatigue resistance is provided, and a method for manufacturing the same is provided.An electric resistance welded steel pipe 1 including a seam region 3 and a base metal region 6, the seam region 3 having a range of ±10 degrees in a pipe circumferential direction with respect to an electric resistance welded seam 2 formed in a pipe longitudinal direction, the base metal region 6 being a region other than the seam region 3, whereinthe electric resistance welded steel pipe 1 has an r-value in the pipe longitudinal direction of 1.0 or greater,H (mm) and W (mm) satisfy formula (1) below, where H (mm) is a difference between Ts(MIN) (mm) and Tb(Ave) (mm) (Tb(Ave) - Ts(MIN)), Ts(MIN) (mm) is a minimum wall thickness value of the seam region 3, Tb(Ave) (mm) is an average wall thickness value of the base metal region 6, and W (mm) is an arc length of a pipe inner surface of the seam region 3, andTs(MAX) (mm) and Tb(Ave) (mm) satisfy formula (2) below, where Ts(MAX) (mm) is a maximum wall thickness value of the seam region 3. H/W≤0.10TsMAX/TbAve≤1.05