Electric resistance welded steel pipe, method for manufacturing the same, and automotive structural member

An electric resistance welded steel pipe comprising:

• a seam region having a range of ±10° in a pipe circumferential direction with respect to an electric resistance welded seam formed in a pipe longitudinal direction;
• and
• a base metal region being a region other than the seam region,
• wherein the electric resistance welded steel pipe has an r-value in the pipe longitudinal direction of 1.0 or greater,
• H (mm) and W (mm) satisfy the following formula (1):
• H/W≤0.10 (1)
• 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, Tb(Ave) (mm) is an average wall thickness value of the base metal region, and W (mm) is an arc length of a pipe inner surface of the seam region, and
• TS(MAX) (mm) and Tb(Ave) (mm) satisfy the following formula (2):
• TS(MAX)/Tb(Ave)≤1.05 (2)
• where Ts(MAX) (mm) is a maximum wall thickness value of the seam region.