Metal pipe and structural member using metal pipe for vehicle

A vehicle comprising:

• a structural member comprising a metal pipe with a quadrangular cross section, the metal pipe further comprising:
• a pair of side walls facing each other;
• a top portion being connected to an upper edge of each of the pair of side walls and located on an outside of the vehicle;
• and
• a bottom portion being connected to a lower edge of each of the pair of side walls and located toward an interior of the vehicle,
• wherein at least one of the side walls, top portion and bottom portion includes two connections to be joined to another member, the connections being separated by a distance six times a height H of a higher one of the pair of side walls or more as measured in a longitudinal direction of the metal pipe,
• each of the pair of side walls includes:
• a high-strength portion located between the connections and having a dimension not less than ⅔H and not more than 3H as measured in the longitudinal direction of the metal pipe, the high-strength portions forming opposite portions of the pair of side walls, each high-strength portion having a yield strength not less than 500 MPa, and
• a pair of low-strength portions located between the connections and sandwiching each of the high-strength portions as determined along the longitudinal direction of the metal pipe, each of the pair of low-strength portions having a yield strength of 60 to 85% of that of the high-strength portion, wherein a dimension of each of the low-strength portions of the metal pipe as measured in the longitudinal direction of the metal pipe is 3/5H or more.