A frame module (20, 22, 23, 24) for a motion assistance apparatus comprising: a frame configured (100, 100R, 100L; 200, 200R, 200L; 300, 300R, 300L; 400R, 400L) to enclose a portion of a user; and at least one reinforcement belt (160; 260, 262, 264, 266; 362, 364, 366; 462, 464, 466, 468) having end portions connected to a respective side of the frame, wherein the at least one reinforcement belt is arranged to reinforce the stiffness of the frame to restrict a splaying level of the frame, in a predetermined direction, wherein the frame comprises: a central portion (110; 210; 310; 410) including a curved surface corresponding to one side surface of the user, wherein the central portion includes a joint mounting portion (115, 115R, 115L; 215, 215R, 215L; 315, 315R, 315L; 415R, 415L) configured to have a rotating member installed thereon, the rotating member configured to be rotated by a driving module, wherein the joint mounting portion extends toward a hip joint portion of the user and characterized in that the at least one reinforcement belt includes a bone belt (164; 264; 364; 464) configured to connect to the frame in a longitudinal direction of a bone of the user, wherein the bone belt is disposed along an iliac crest of the user, wherein a first side of the bone belt is connected to a first side of the joint mounting portion, and a second side of the bone belt is connected to a front portion of the frame. a frame configured (100, 100R, 100L; 200, 200R, 200L; 300, 300R, 300L; 400R, 400L) to enclose a portion of a user; and at least one reinforcement belt (160; 260, 262, 264, 266; 362, 364, 366; 462, 464, 466, 468) having end portions connected to a respective side of the frame, wherein the at least one reinforcement belt is arranged to reinforce the stiffness of the frame to restrict a splaying level of the frame, in a predetermined direction, wherein the frame comprises: a central portion (110; 210; 310; 410) including a curved surface corresponding to one side surface of the user, wherein the central portion includes a joint mounting portion (115, 115R, 115L; 215, 215R, 215L; 315, 315R, 315L; 415R, 415L) configured to have a rotating member installed thereon, the rotating member configured to be rotated by a driving module, wherein the joint mounting portion extends toward a hip joint portion of the user and characterized in that the at least one reinforcement belt includes a bone belt (164; 264; 364; 464) configured to connect to the frame in a longitudinal direction of a bone of the user, wherein the bone belt is disposed along an iliac crest of the user, wherein a first side of the bone belt is connected to a first side of the joint mounting portion, and a second side of the bone belt is connected to a front portion of the frame. a central portion (110; 210; 310; 410) including a curved surface corresponding to one side surface of the user, wherein the central portion includes a joint mounting portion (115, 115R, 115L; 215, 215R, 215L; 315, 315R, 315L; 415R, 415L) configured to have a rotating member installed thereon, the rotating member configured to be rotated by a driving module, wherein the joint mounting portion extends toward a hip joint portion of the user and characterized in that the at least one reinforcement belt includes a bone belt (164; 264; 364; 464) configured to connect to the frame in a longitudinal direction of a bone of the user, wherein the bone belt is disposed along an iliac crest of the user, wherein a first side of the bone belt is connected to a first side of the joint mounting portion, and a second side of the bone belt is connected to a front portion of the frame.