A cleaner device for a belt conveyor, the cleaner device comprising: a body ; a movable member provided so as to be capable of being moved vertically; a vertical moving unit for moving the movable member ; a scraper which is disposed below the movable member and which extends horizontally, the scraper having a lower end part that is in contact with a surface of a belt of a belt conveyor , thereby removing foreign substances from the surface of the belt ; and a pressing unit comprising at least one of pressing units provided on the movable member and being configured to press the scraper , the pressing unit being configured to automatically maintain a pressing force on the scraper so that the lower end part of the scraper is in close contact with the surface of the belt , wherein the scraper comprises a plurality of scrapers and the plurality of scrapers is adjacent to each other horizontally and is pressed by the pressing units , and in the scrapers that are adjacent to each other, a left scraper has a right side end provided with a first inclined part and a right scraper has a left side end provided with a second inclined part which corresponds to the first inclined part and which is in close contact with the first inclined part , characterized in that any one of the left scraper and the right scraper that are adjacent to each other has a lubricating liquid injection part and has a passage for supplying a lubricating liquid from the lubricating liquid injection part to a space between the first inclined part and the second inclined part , a storage part for storing the lubricating liquid is formed between the first inclined part and the second inclined part , and a packing is provided between the right side end and the left side end that are facing each other from the left scraper and the right scraper . a body ; a movable member provided so as to be capable of being moved vertically; a vertical moving unit for moving the movable member ; a scraper which is disposed below the movable member and which extends horizontally, the scraper having a lower end part that is in contact with a surface of a belt of a belt conveyor , thereby removing foreign substances from the surface of the belt ; and a pressing unit comprising at least one of pressing units provided on the movable member and being configured to press the scraper , the pressing unit being configured to automatically maintain a pressing force on the scraper so that the lower end part of the scraper is in close contact with the surface of the belt , wherein the scraper comprises a plurality of scrapers and the plurality of scrapers is adjacent to each other horizontally and is pressed by the pressing units , and in the scrapers that are adjacent to each other, a left scraper has a right side end provided with a first inclined part and a right scraper has a left side end provided with a second inclined part which corresponds to the first inclined part and which is in close contact with the first inclined part , characterized in that any one of the left scraper and the right scraper that are adjacent to each other has a lubricating liquid injection part and has a passage for supplying a lubricating liquid from the lubricating liquid injection part to a space between the first inclined part and the second inclined part , a storage part for storing the lubricating liquid is formed between the first inclined part and the second inclined part , and a packing is provided between the right side end and the left side end that are facing each other from the left scraper and the right scraper . <EOS>