A device-mounting support member for mounting a wearable device onto an eyeglass frame, comprising: an eyeglass frame attachment portion having a first pressing portion (201 a) adapted to be pressed against a temple of the eyeglass frame; a support frame portion to be attached with the wearable device, the support frame portion extending from the eyeglass frame attachment portion substantially parallel to the temple of the eyeglass frame; and a head abutment portion which is coupled to the support frame portion and to be abutted to a head of a wearer, wherein: the support frame portion is arranged on the outside of the temple of the eyeglass frame; the head abutment portion is arranged on the headside of the temple of the eyeglass frame and curved to be adapted to extend along the head shape of the wearer when the support member is attached to the eyeglass frame, in order to prevent rotation about the temple; the support frame portion and the head abutment portion are coupled to each other via a support bridge portion that straddles the temple of the eyeglass frame; the first pressing portion (201 a) of the eyeglass frame attachment portion is arranged on the head side of the temple of the eyeglass frame; the head abutment portion has a second pressing portion to be pressed against the head side of the temple of the eyeglass frame; the eyeglass frame attachment portion further has an outside attachment portion coupled to the support frame portion and arranged on the outside of the temple of the eyeglass frame, and an attachment bridge portion (201 c) for coupling, across the temple of the eyeglass frame, the first pressing portion (201 a) to the outside attachment portion; and the support frame portion exerts an elastic force, when the support member is attached to the eyeglass frame, so as to cause the first pressing portion (201 a) and the second pressing portion to be pressed against the temple of the eyeglass frame from the head side toward the opposite side of the temple. an eyeglass frame attachment portion having a first pressing portion (201 a) adapted to be pressed against a temple of the eyeglass frame; a support frame portion to be attached with the wearable device, the support frame portion extending from the eyeglass frame attachment portion substantially parallel to the temple of the eyeglass frame; and a head abutment portion which is coupled to the support frame portion and to be abutted to a head of a wearer, wherein: the support frame portion is arranged on the outside of the temple of the eyeglass frame; the head abutment portion is arranged on the headside of the temple of the eyeglass frame and curved to be adapted to extend along the head shape of the wearer when the support member is attached to the eyeglass frame, in order to prevent rotation about the temple; the support frame portion and the head abutment portion are coupled to each other via a support bridge portion that straddles the temple of the eyeglass frame; the first pressing portion (201 a) of the eyeglass frame attachment portion is arranged on the head side of the temple of the eyeglass frame; the head abutment portion has a second pressing portion to be pressed against the head side of the temple of the eyeglass frame; the eyeglass frame attachment portion further has an outside attachment portion coupled to the support frame portion and arranged on the outside of the temple of the eyeglass frame, and an attachment bridge portion (201 c) for coupling, across the temple of the eyeglass frame, the first pressing portion (201 a) to the outside attachment portion; and the support frame portion exerts an elastic force, when the support member is attached to the eyeglass frame, so as to cause the first pressing portion (201 a) and the second pressing portion to be pressed against the temple of the eyeglass frame from the head side toward the opposite side of the temple. the support frame portion is arranged on the outside of the temple of the eyeglass frame; the head abutment portion is arranged on the headside of the temple of the eyeglass frame and curved to be adapted to extend along the head shape of the wearer when the support member is attached to the eyeglass frame, in order to prevent rotation about the temple; the support frame portion and the head abutment portion are coupled to each other via a support bridge portion that straddles the temple of the eyeglass frame; the first pressing portion (201 a) of the eyeglass frame attachment portion is arranged on the head side of the temple of the eyeglass frame; the head abutment portion has a second pressing portion to be pressed against the head side of the temple of the eyeglass frame; the eyeglass frame attachment portion further has an outside attachment portion coupled to the support frame portion and arranged on the outside of the temple of the eyeglass frame, and an attachment bridge portion (201 c) for coupling, across the temple of the eyeglass frame, the first pressing portion (201 a) to the outside attachment portion; and the support frame portion exerts an elastic force, when the support member is attached to the eyeglass frame, so as to cause the first pressing portion (201 a) and the second pressing portion to be pressed against the temple of the eyeglass frame from the head side toward the opposite side of the temple.