A scroll compressor including: a casing; a driving motor having a stator fixed to an inner space of the casing and a rotor rotatably provided in the stator; a first scroll provided on one side of the driving motor; a second scroll engaged with the first scroll to form a compression chamber with the first scroll, while performing an orbiting movement, and having a plurality of first key recesses; a rotating shaft having one end coupled to the rotor of the driving motor and an other end eccentrically coupled to the second scroll so as to overlap with the compression chamber in a radial direction; wherein the other end of the rotating shaft is supported by the first scroll, the first scroll being a fixed scroll; a frame provided on a side of the first scroll with the second scroll interposed therebetween and having a plurality of second key recesses; and an Oldham ring having a ring portion located between the frame and the second scroll and a plurality of key portions (175, 176) protruding from the ring portion and slidably inserted into the plurality of first key recesses and the plurality of second key recesses; characterized in that the scroll compressor further includes a wear preventing member formed of a material different from the Oldham ring or the second scroll; wherein the wear preventing member is provided between the plurality of first key recesses and the plurality of key portions (175, 176) of the Oldham ring inserted therein or provided between the plurality of second key recesses and the plurality of key portions (175, 176) of the Oldham ring inserted therein; wherein the wear preventing member includes a first reinforcement surface and a second reinforcement surface arranged in parallel in a radial direction, and a third reinforcement surface extending from one axial end where the first reinforcement surface and the second reinforcement surface face each other, in a circumferential direction, to connect the first reinforcement surface and the second reinforcement surface, and escape preventing surfaces (184a, 184b) are further formed on the first reinforcement surface and the second reinforcement surface and extend from one facing ends of the first reinforcement surface and the second reinforcement surface to support the wear preventing member in radial direction, and an escape preventing recess is formed at one end of the key recess and expanding, relative to a width of the key recess, in the circumferential direction, into which the escape preventing surfaces (184a, 184b) are inserted. a casing; a driving motor having a stator fixed to an inner space of the casing and a rotor rotatably provided in the stator; a first scroll provided on one side of the driving motor; a second scroll engaged with the first scroll to form a compression chamber with the first scroll, while performing an orbiting movement, and having a plurality of first key recesses; a rotating shaft having one end coupled to the rotor of the driving motor and an other end eccentrically coupled to the second scroll so as to overlap with the compression chamber in a radial direction; wherein the other end of the rotating shaft is supported by the first scroll, the first scroll being a fixed scroll; a frame provided on a side of the first scroll with the second scroll interposed therebetween and having a plurality of second key recesses; and an Oldham ring having a ring portion located between the frame and the second scroll and a plurality of key portions (175, 176) protruding from the ring portion and slidably inserted into the plurality of first key recesses and the plurality of second key recesses; characterized in that the scroll compressor further includes a wear preventing member formed of a material different from the Oldham ring or the second scroll; wherein the wear preventing member is provided between the plurality of first key recesses and the plurality of key portions (175, 176) of the Oldham ring inserted therein or provided between the plurality of second key recesses and the plurality of key portions (175, 176) of the Oldham ring inserted therein; wherein the wear preventing member includes a first reinforcement surface and a second reinforcement surface arranged in parallel in a radial direction, and a third reinforcement surface extending from one axial end where the first reinforcement surface and the second reinforcement surface face each other, in a circumferential direction, to connect the first reinforcement surface and the second reinforcement surface, and escape preventing surfaces (184a, 184b) are further formed on the first reinforcement surface and the second reinforcement surface and extend from one facing ends of the first reinforcement surface and the second reinforcement surface to support the wear preventing member in radial direction, and an escape preventing recess is formed at one end of the key recess and expanding, relative to a width of the key recess, in the circumferential direction, into which the escape preventing surfaces (184a, 184b) are inserted.