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.