Method for joining members and joined body

A method for joining members, the method comprising:

• providing
• a first member including at least two pipe portions extending in an identical direction and integrated, the first member including a recess provided between two adjacent pipe portions of the at least two pipe portions, the recess extending in a longitudinal direction of the at least two pipe portions from end surfaces of the at least two pipe portions, a part of the recess serving as a locking portion, and
• a second member including a locking wall formed with at least two hole portions into which the at least two pipe portions of the first member are insertable respectively;
• inserting the at least two pipe portions of the first member into the at least two hole portions of the second member until the locking portion abuts on the locking wall;
• and
• pipe-expanding an insertion portion of the at least two pipe portions of the first member inserted into the second member to join the insertion portion to the second member by press-fitting.