An assembly comprising a first FPCB, a second FPCB and a FPCB connector, the FPCB connector comprising: a first main body to which the first FPCB is coupled; and a second main body to which the second FPCB is coupled, the second main body being coupled to the first main body to be electrically connected thereto, wherein at least one of the first main body and the second main body is coupled to the corresponding FPCB without soldering, wherein the first main body includes: a first body having an insert groove into which the first FPCB is inserted; and a first fixing portion coupled to the first body into which the first FPCB is inserted to fix the first FPCB, wherein a stepped portion formed by a height difference is formed at a bottom of the first body, and the first FPCB is located at one side of the stepped portion to contact one side of the stepped portion or be spaced apart from one side of the stepped portion, characterized in that the stepped portion includes: a high surface having a great height; and a low surface having a relatively smaller height compared to the high surface, wherein the first FPCB has a first body portion and a first end portion so that the first end portion of the first FPCB is thicker than the first body portion of the first FPCB, the first end portion of the first FPCB having a greater thickness is in contact with the high surface of the stepped portion or is spaced apart from the high surface of the stepped portion, a preset space is formed between the low surface of the stepped portion and the first body portion of the first FPCB, and the first fixing portion is inserted into the space and coupled to the first body to come into contact with the first body portion of the first FPCB. a first main body to which the first FPCB is coupled; and a second main body to which the second FPCB is coupled, the second main body being coupled to the first main body to be electrically connected thereto, wherein at least one of the first main body and the second main body is coupled to the corresponding FPCB without soldering, wherein the first main body includes: a first body having an insert groove into which the first FPCB is inserted; and a first fixing portion coupled to the first body into which the first FPCB is inserted to fix the first FPCB, wherein a stepped portion formed by a height difference is formed at a bottom of the first body, and the first FPCB is located at one side of the stepped portion to contact one side of the stepped portion or be spaced apart from one side of the stepped portion, characterized in that the stepped portion includes: a high surface having a great height; and a low surface having a relatively smaller height compared to the high surface, wherein the first FPCB has a first body portion and a first end portion so that the first end portion of the first FPCB is thicker than the first body portion of the first FPCB, the first end portion of the first FPCB having a greater thickness is in contact with the high surface of the stepped portion or is spaced apart from the high surface of the stepped portion, a preset space is formed between the low surface of the stepped portion and the first body portion of the first FPCB, and the first fixing portion is inserted into the space and coupled to the first body to come into contact with the first body portion of the first FPCB. a first body having an insert groove into which the first FPCB is inserted; and a first fixing portion coupled to the first body into which the first FPCB is inserted to fix the first FPCB, wherein a stepped portion formed by a height difference is formed at a bottom of the first body, and the first FPCB is located at one side of the stepped portion to contact one side of the stepped portion or be spaced apart from one side of the stepped portion, characterized in that the stepped portion includes: a high surface having a great height; and a low surface having a relatively smaller height compared to the high surface, wherein the first FPCB has a first body portion and a first end portion so that the first end portion of the first FPCB is thicker than the first body portion of the first FPCB, the first end portion of the first FPCB having a greater thickness is in contact with the high surface of the stepped portion or is spaced apart from the high surface of the stepped portion, a preset space is formed between the low surface of the stepped portion and the first body portion of the first FPCB, and the first fixing portion is inserted into the space and coupled to the first body to come into contact with the first body portion of the first FPCB. a high surface having a great height; and a low surface having a relatively smaller height compared to the high surface, wherein the first FPCB has a first body portion and a first end portion so that the first end portion of the first FPCB is thicker than the first body portion of the first FPCB, the first end portion of the first FPCB having a greater thickness is in contact with the high surface of the stepped portion or is spaced apart from the high surface of the stepped portion, a preset space is formed between the low surface of the stepped portion and the first body portion of the first FPCB, and the first fixing portion is inserted into the space and coupled to the first body to come into contact with the first body portion of the first FPCB.