A wiper blade assembling adapter for coupling a wiper blade to a wiper arm, which has a distal end at which a plurality of coupling elements (1211a, 1211b) facing each other protrude inward from each side surface surrounding the adapter, the wiper blade assembling adapter comprising: a main body part coupled to the wiper blade; and a locking part rotatably provided in the main body part, wherein the main body part includes a plurality of guide parts (315a, 315b), which each have an insertion part (3151a, 3151b) into which the coupling element (1211a, 1211b) of the wiper arm is inserted in a first direction and a catching part (3152a, 3152b) which extends from a distal end of the insertion part (3151a, 3151b) in a direction different from the insertion part (3151a, 3151b) and which is configured to block movement of the coupling element (1211a, 1211b) in the first direction after the coupling element (1211a, 1211b) moves in a second direction, and a hinge part disposed at one side of the guide part (315a, 315b), and the locking part has a rotary surface which is rotatably coupled to the hinge part and a cover surface which extends from the rotary surface and covers an outer surface of the wiper arm that surrounds the main body part, and wherein the guide part (315a, 315b) has a first guide part adjacent to the hinge part and a second guide part disposed opposite the hinge part with respect to the first guide part and the cover surface has a cover element that extends from a distal end toward the guide part (315a, 315b), characterized in that the plurality of coupling elements (1211a, 1211b) of the wiper arm protrude inward at different heights, and the plurality of guide parts (315a, 315b) are provided such that heights of the catching parts (3152a, 3152b) are different, and the hinge part has a rotation limiting element protruding from one side of the hinge part, and the locking part changes between an unlocking state, in which a lower end of the cover surface is disposed below the rotation limiting element and causes an outer surface of the main body part to be exposed, and a locking state, in which the rotary surface rotates and the lower end of the cover surface moves over the rotation limiting element and covers the outer surface of the main body part, and the cover element covers at least the insertion part of the first guide part in the locking state. a main body part coupled to the wiper blade; and a locking part rotatably provided in the main body part, wherein the main body part includes a plurality of guide parts (315a, 315b), which each have an insertion part (3151a, 3151b) into which the coupling element (1211a, 1211b) of the wiper arm is inserted in a first direction and a catching part (3152a, 3152b) which extends from a distal end of the insertion part (3151a, 3151b) in a direction different from the insertion part (3151a, 3151b) and which is configured to block movement of the coupling element (1211a, 1211b) in the first direction after the coupling element (1211a, 1211b) moves in a second direction, and a hinge part disposed at one side of the guide part (315a, 315b), and the locking part has a rotary surface which is rotatably coupled to the hinge part and a cover surface which extends from the rotary surface and covers an outer surface of the wiper arm that surrounds the main body part, and wherein the guide part (315a, 315b) has a first guide part adjacent to the hinge part and a second guide part disposed opposite the hinge part with respect to the first guide part and the cover surface has a cover element that extends from a distal end toward the guide part (315a, 315b), characterized in that the plurality of coupling elements (1211a, 1211b) of the wiper arm protrude inward at different heights, and the plurality of guide parts (315a, 315b) are provided such that heights of the catching parts (3152a, 3152b) are different, and the hinge part has a rotation limiting element protruding from one side of the hinge part, and the locking part changes between an unlocking state, in which a lower end of the cover surface is disposed below the rotation limiting element and causes an outer surface of the main body part to be exposed, and a locking state, in which the rotary surface rotates and the lower end of the cover surface moves over the rotation limiting element and covers the outer surface of the main body part, and the cover element covers at least the insertion part of the first guide part in the locking state.