SUPPORT MEMBER, SUPPORT STRUCTURE, AND OUTER WALL STRUCTURE

A support member (6) is a member for supporting a first outer wall surface material (3), and comprises a support fixed portion (61), a support extended portion (62), and an end surface supporting portion (63). The support fixed portion (61) is fixed to a second surface (212) of a wall base material (21) that is provided so as to surround an opening portion (1A), the second surface (212) being positioned further toward an outdoor (OD) side than a first surface (211) that is adjacent to the opening portion (1A). The support extended portion (62) extends toward the opening portion (1A) side, from the support fixed portion (61) to a region facing the first surface (211), thereby supporting the first outer wall surface material (3) from an indoor (ID) side. The end surface supporting portion (63) has an abutting surface (631) which extends toward the outdoor (OD) side from the support extended portion (62), and which abuts one end surface (31) of the first outer wall surface material (3) on the opening portion (1A) side thereof, thereby supporting said one end surface (31).