A softbox speedring having a fitting assembly structure for a photograph or an image, the speedring comprising: a speedring body including a central hole formed at a center of the speedring body, a plurality of adaptor inserting holes formed along an outer circumferential surface of the speedring body, and rotational shaft seating grooves formed in first perpendicular surface and second perpendicular surface of each adaptor inserting hole; and an adaptor including a head part including rotational shafts (212, 214) protruding from opposite perpendicular surfaces of the head part to be fitted into and assembled with the rotational shaft seating grooves, and a body part provided at a lower portion of the head part and including a pole inserting part formed in a lower end of the body part, characterized in that the speedring body further includes: an adaptor mounting member that is provided on an inner perpendicular surface of the adaptor inserting hole, is formed in a structure of a disk, and includes the rotational shaft seating groove formed in a center of the disk and a rotational shaft introducing port formed at an upper portion of the disk to be open to communicate with the rotational shaft seating groove, and wherein the adaptor includes a locking plate protruding along an edge of the head part to prevent the adaptor from deviating from an upper portion of the speedring body. a speedring body including a central hole formed at a center of the speedring body, a plurality of adaptor inserting holes formed along an outer circumferential surface of the speedring body, and rotational shaft seating grooves formed in first perpendicular surface and second perpendicular surface of each adaptor inserting hole; and an adaptor including a head part including rotational shafts (212, 214) protruding from opposite perpendicular surfaces of the head part to be fitted into and assembled with the rotational shaft seating grooves, and a body part provided at a lower portion of the head part and including a pole inserting part formed in a lower end of the body part, characterized in that the speedring body further includes: an adaptor mounting member that is provided on an inner perpendicular surface of the adaptor inserting hole, is formed in a structure of a disk, and includes the rotational shaft seating groove formed in a center of the disk and a rotational shaft introducing port formed at an upper portion of the disk to be open to communicate with the rotational shaft seating groove, and wherein the adaptor includes a locking plate protruding along an edge of the head part to prevent the adaptor from deviating from an upper portion of the speedring body. an adaptor mounting member that is provided on an inner perpendicular surface of the adaptor inserting hole, is formed in a structure of a disk, and includes the rotational shaft seating groove formed in a center of the disk and a rotational shaft introducing port formed at an upper portion of the disk to be open to communicate with the rotational shaft seating groove, and wherein the adaptor includes a locking plate protruding along an edge of the head part to prevent the adaptor from deviating from an upper portion of the speedring body.