A wearable electronic device comprising: a housing; and a strap connected to one side of the housing, wherein the housing comprises: at least one strap connecting structure, in which the strap is coupled to at least a portion of an outside thereof, wherein the at least one strap connecting structure comprises: a housing body; an opening formed from a center of the housing body in an outward direction and into which a portion of the strap is inserted; a first holding recess formed in a first diagonal direction between an inward direction of the housing body from the opening and a vertical direction that is perpendicular to a horizontal direction that is parallel to a flat surface with respect to the horizontal direction when the center of the housing body is positioned on the flat surface to face an upper side; and a second holding recess formed in a second diagonal direction that is different from the first diagonal direction between the inward direction of the housing body from the opening and the vertical direction with respect to the horizontal direction and disposed to correspond to the first holding recess in the vertical direction, and wherein the strap comprises: a strap body (131_1); a holding body connected to one side of the strap body; a first holding part protruding from one end of the holding body in an inward direction of the housing and inserted into the first holding recess; and a second holding part disposed at an opposite end of the holding body and inserted into the second holding recess. a housing; and a strap connected to one side of the housing, wherein the housing comprises: at least one strap connecting structure, in which the strap is coupled to at least a portion of an outside thereof, wherein the at least one strap connecting structure comprises: a housing body; an opening formed from a center of the housing body in an outward direction and into which a portion of the strap is inserted; a first holding recess formed in a first diagonal direction between an inward direction of the housing body from the opening and a vertical direction that is perpendicular to a horizontal direction that is parallel to a flat surface with respect to the horizontal direction when the center of the housing body is positioned on the flat surface to face an upper side; and a second holding recess formed in a second diagonal direction that is different from the first diagonal direction between the inward direction of the housing body from the opening and the vertical direction with respect to the horizontal direction and disposed to correspond to the first holding recess in the vertical direction, and wherein the strap comprises: a strap body (131_1); a holding body connected to one side of the strap body; a first holding part protruding from one end of the holding body in an inward direction of the housing and inserted into the first holding recess; and a second holding part disposed at an opposite end of the holding body and inserted into the second holding recess. at least one strap connecting structure, in which the strap is coupled to at least a portion of an outside thereof, wherein the at least one strap connecting structure comprises: a housing body; an opening formed from a center of the housing body in an outward direction and into which a portion of the strap is inserted; a first holding recess formed in a first diagonal direction between an inward direction of the housing body from the opening and a vertical direction that is perpendicular to a horizontal direction that is parallel to a flat surface with respect to the horizontal direction when the center of the housing body is positioned on the flat surface to face an upper side; and a second holding recess formed in a second diagonal direction that is different from the first diagonal direction between the inward direction of the housing body from the opening and the vertical direction with respect to the horizontal direction and disposed to correspond to the first holding recess in the vertical direction, and a housing body; an opening formed from a center of the housing body in an outward direction and into which a portion of the strap is inserted; a first holding recess formed in a first diagonal direction between an inward direction of the housing body from the opening and a vertical direction that is perpendicular to a horizontal direction that is parallel to a flat surface with respect to the horizontal direction when the center of the housing body is positioned on the flat surface to face an upper side; and a second holding recess formed in a second diagonal direction that is different from the first diagonal direction between the inward direction of the housing body from the opening and the vertical direction with respect to the horizontal direction and disposed to correspond to the first holding recess in the vertical direction, and wherein the strap comprises: a strap body (131_1); a holding body connected to one side of the strap body; a first holding part protruding from one end of the holding body in an inward direction of the housing and inserted into the first holding recess; and a second holding part disposed at an opposite end of the holding body and inserted into the second holding recess. a strap body (131_1); a holding body connected to one side of the strap body; a first holding part protruding from one end of the holding body in an inward direction of the housing and inserted into the first holding recess; and a second holding part disposed at an opposite end of the holding body and inserted into the second holding recess.